Improvements for Heavy-Duty Engine and Vehicle Fuel Efficiency Test Procedures, and Other Technical Amendments

Federal RegisterSep 13, 2022

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DEPARTMENT OF TRANSPORTATION

National Highway Traffic Safety Administration

49 CFR Part 535

[NHTSA-2020-0079]

RIN 2127-AM28

Improvements for Heavy-Duty Engine and Vehicle Fuel Efficiency Test Procedures, and Other Technical Amendments

AGENCY:

National Highway Traffic Safety Administration, Department of Transportation.

ACTION:

Proposed rule.

SUMMARY:

The National Highway Traffic Safety Administration (NHTSA) is proposing minor technical amendments to the test procedures for heavy-duty engines and vehicles to improve accuracy and reduce testing burden. These amendments affect the certification procedures for fuel efficiency standards and related requirements. These proposed amendments increase compliance flexibility, harmonize with other requirements, add clarity, correct errors, and streamline the regulations. Given the nature of the proposed changes, NHTSA does not expect either significant environmental impacts or significant economic impacts for any sector.

DATES:

Comments:

Comments are requested on or before November 14, 2022.

ADDRESSES:

You may send comments, identified by Docket No. NHTSA-2020-0079 by any of the following methods:

•

Federal eRulemaking Portal: https://www.regulations.gov.

Follow the instructions for sending comments.

•

Fax: NHTSA:

(202) 493-2251.

•

Mail:

○ Docket Management Facility, M-30, U.S. Department of Transportation, West Building, Ground Floor, Rm. W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.

•

Hand Delivery:

○ West Building, Ground Floor, Rm. W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590, between 9 a.m. and 4 p.m. Eastern Time, Monday through Friday, except Federal holidays.

Instructions:

All submissions received must include the agency name and docket number or Regulatory Information Number (RIN) for this rulemaking. All comments received will be posted without change to

https://www.regulations.gov,

including any personal information provided.

Docket:

For access to the dockets to read background documents or comments received, go to

https://www.regulations.gov,

and/or: Docket Management Facility, M-30, U.S. Department of Transportation, West Building, Ground Floor, Rm. W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590. The Docket Management NHTSA: Docket Management Facility, M-30, U.S. Department of Transportation (DOT), West Building, Ground Floor, Rm. W12-140, 1200 New Jersey Ave. SE, Washington, DC 20590. The DOT Docket Management Facility is open between 9 a.m. and 5 p.m. Eastern Time, Monday through Friday, except Federal holidays. However, due to current COVID-19 restrictions, access to the office is limited. Please call ahead if you plan to drop off or pick up a document to ensure someone is available to assist them. The Docket Management Facility can be reached at (202) 366-9826 or (202) 366-9317 to arrange a drop off/pick up.

FOR FURTHER INFORMATION CONTACT:

Gregory Powell, Office of Rulemaking, Fuel Economy Division, National Highway Traffic Safety Administration, 1200 New Jersey Avenue SE, Washington, DC 20590; telephone number: (202) 493-0515.

SUPPLEMENTARY INFORMATION:

Table of Contents

I. General Information

A. Does this action apply to me?

B. What action is the Agency taking?

C. What are the incremental costs and benefits of this action?

II. Medium and Heavy-Duty Fuel Efficiency Program Technical Amendments

A. Overview

B. Greenhouse Gas Emission Model Supplemental Notice of Proposed Rulemaking

C. 49 CFR 535.3 Applicability

D. 49 CFR 535.4 Definitions

E. 49 CFR 535.5 Standards

F. 49 CFR 535.6 Measurement and Calculation Procedures

G. 49 CFR 535.7 Averaging, Banking, and Trading (ABT) Credit Program

H. 49 CFR 535.8 Reporting and Recordkeeping Requirements

I. 49 CFR 535.9 Enforcement Approach

J. 49 CFR 535.10 How do manufacturers comply with fuel consumption standards?

III. Statutory Authority and Executive Order Reviews

A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review

B. Paperwork Reduction Act (PRA)

C. Regulatory Flexibility Act (RFA)

D. Unfunded Mandates Reform Act (UMRA)

E. Executive Order 13132: Federalism

F. Executive Order 13175: Consultation and Coordination With Indian Tribal Governments

G. Executive Order 13045: Protection of Children From Environmental Health Risks and Safety Risks

H. Executive Order 13211: Actions Concerning Regulations That Significantly Affect Energy Supply, Distribution or Use

I. National Technology Transfer and Advancement Act (NTTAA)

J. Executive Order 12898: Federal Actions To Address Environmental Justice in Minority Populations and Low-Income Populations

IV. Regulatory Text

I. General Information

A. Does this action apply to me?

This action would affect companies that manufacture, sell, or import into the United States new heavy-duty engines and new Class 2b through 8 trucks, including combination tractors, all types of buses, vocational vehicles including municipal, commercial, recreational vehicles, and

3/4

-ton and 1-ton pickup trucks and vans. The heavy-duty category incorporates all motor vehicles with a gross vehicle weight rating of 8,500 lbs. or greater, and the engines that power them, except for medium-duty passenger vehicles already covered by the corporate average fuel economy standards and greenhouse gas standards issued for light-duty vehicles.

https://www.ecfr.gov/cgi-bin/text-idx?SID=7031ab132d93d2ab3729f7c3b8e412f0&mc=true&node=pt49.6.535&rgn=div5.

Regulated categories and entities include the following:

Category

NAICS codes

Examples of potentially regulated entities

Industry

333618, 336111, 336112, 336120, 336211, 336212, 336611, 336911, 336999

Motor vehicle manufacturers and engine manufacturers.

Industry

811111, 811112, 811198, 423110

Commercial importers of vehicles and vehicle components.

Industry

335312, 811198

Alternative fuel vehicle converters.

Industry

326199, 332431

Portable fuel container manufacturers.

North American Industry Classification System (NAICS).

This list is not intended to be exhaustive, but rather provides a guide for readers regarding entities likely to be regulated by this action. If you have questions regarding the applicability of this action to a particular entity, consult the person listed in the

FOR FURTHER INFORMATION CONTACT

section.

B. What action is the Agency taking?

This action proposes to amend the regulations that implement our fuel efficiency standards for engines and vehicles. The proposed amendments are technical in nature and include corrections and clarifications to a variety of existing regulatory provisions to improve consistency with related EPA standards and with NHTSA's original intent for those provisions. In other words, this proposal comprises a variety of small changes for multiple types of engines and vehicles.

These amendments parallel similar ones in a rulemaking conducted by the EPA under RIN 2060-AU62. The proposed technical amendments are intended to maintain the alignment of EPA's Medium and Heavy-Duty Vehicle Greenhouse Gas Emissions and NHTSA's Fuel Efficiency Standards. The technical amendments to NHTSA regulations contained in this proposal are both necessary and completely align with the technical amendments finalized by EPA under the parallel rulemaking referenced in this paragraph.

The majority of the amendments being proposed would modify existing test procedures for heavy-duty highway engines and vehicles. These test procedure changes would improve accuracy, and in some cases, reduce test burden.

Other heavy-duty highway amendments would update NHTSA regulations to enhance implementation of existing fuel efficiency standards. For example, some changes would reduce the likelihood that manufacturers would need to conduct unique certification testing for compliance with NHTSA, Canadian, and Californian standards. Some amendments would make it easier for manufacturers to more fully account for the fuel efficiency benefits of advanced fuel efficiency improving technology, which could provide them the opportunity to generate additional fuel consumption improvements for compliance. These amendments are described in Section II.

Additionally, as a matter of housekeeping, NHTSA is proposing to remove portions of its regulations that were vacated by the United States Court of Appeals for the District of Columbia Circuit. In November 2021, that Court “vacate[d] all portions of the [2016 joint NHTSA and EPA] rule that apply to trailers.”

Truck Trailer Mfrs. Ass'n, Inc.

EPA,

17 F.4th 1198, 1200 (D.C. Cir. 2021). The underlying statute authorizes NHTSA to examine the fuel efficiency of and prescribe fuel economy standards for “commercial medium-duty [and/or] heavy-duty on-highway vehicles.” 49 U.S.C. 32902(b)(1)(C); 49 U.S.C. 32902(k)(2). The Court reasoned that trailers do not qualify as “vehicles” when that term is used in the fuel economy context because trailers are motorless and use no fuel.

Truck Trailer Mfrs. Ass'n, Inc.,

17 F.4th at 1200, 1204-08. Accordingly, the Court held that NHTSA does not have the authority to regulate the fuel economy of trailers.

Id.

at 1208.

NHTSA is therefore proposing to remove the vacated trailer provisions from its regulations

For similar reasons, the Court also held that the statute authorizing EPA to regulate the emissions of “motor vehicles” does not encompass trailers.

Id.

at 1200-03. The Court affirmed, however, that both agencies still “can regulate

tractors

based on the

trailers

they pull.”

Id.

at 1208. Moreover, NHTSA is still authorized to regulate trailers in other contexts, such as under 49 U.S.C. Chapter 301.

See

49 U.S.C. 30102(a)(7) (defining “motor vehicle” to include “a vehicle . . . drawn by mechanical power”);

Truck Trailer Mfrs. Ass'n, Inc.,

17 F.4th at 1207 (“A trailer is `drawn by mechanical power.' ”).

C. What are the incremental costs and benefits of this action?

This action would be limited in scope and is not intended to include amendments that would have significant economic or environmental impacts. NHTSA has not drafted a Regulatory Impact Analysis.

II. Medium and Heavy-Duty Fuel Efficiency Program Technical Amendments

A. Overview

In September 2011, NHTSA and EPA finalized Phase 1 of the Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles. The Phase 1 program covered new commercial heavy-duty vehicles and work trucks manufactured in model years 2014 to 2018 and beyond, with unique standards for combination tractors, heavy-duty pickup trucks and vans, and vocational vehicles, as well as separate standards for engines in tractors and vocational vehicles. NHTSA and EPA finalized Phase 2 of the standards in October 2016. Besides standards being more stringent, the Phase 2 program also incorporated enhanced test procedures that (among other things) allow individual drivetrain and powertrain performance to be reflected in the vehicle certification process; and included an expanded and improved compliance simulation model.

Since the promulgation of the Phase 2 regulations, manufacturers have been revising their internal test procedures for compliance with the new requirements that begin in model year 2021. In doing so, they have identified to the agencies several areas in which the test procedure regulations could be improved (in terms of overall accuracy, repeatability and clarity) without changing the effective stringency of the standards.

In its May 12, 2020 NPRM, EPA proposed numerous changes to the test procedure regulations to address manufacturers' concerns and to address other issues it had identified. EPA sought comment on those changes and issued a final rule on December 28, 2020 responding to the comments and adjusting the regulatory changes as appropriate. NHTSA has carefully reviewed all technical amendments in the EPA proposal, public comments to the proposal, and the technical amendments that EPA finalized, and is proposing to make technical amendments that parallel the technical amendments that EPA finalized. NHTSA's proposed regulatory changes

described below consist primarily of references and definitions contained in NHTSA regulations which were impacted by the technical amendments finalized by the EPA. This proposal also includes various minor editorial changes to NHTSA regulations that simply correct typographical/formatting errors or revise NHTSA's regulatory text to improve clarity or to update references to EPA regulations that have changed as a result of the EPA technical amendments.

B. Greenhouse Gas Emission Model Supplemental Notice of Proposed Rulemaking

In conjunction with its final rule issued on December 28, 2020, EPA issued a supplemental notice of proposed rulemaking (SNPRM) proposing further revisions to the Greenhouse Gas Emissions Model (GEM). In the supplemental notice of proposed rulemaking, EPA proposed to revise GEM after consideration of comments solicited and received on the Technical Amendments proposed rule. The details of these changes to the GEM and other considerations are provided on EPA's website.

“Greenhouse Gas Emissions Model (GEM) for Medium- and Heavy-Duty Vehicle Compliance.” (n.d.).

https://www.epa.gov/regulations-emissions-vehicles-and-engines/greenhouse-gas-emissions-model-gem-medium-and-heavy-duty.

Accessed May 18, 2022.

C. 49 CFR 535.1 Scope

NHTSA is proposing to amend the scope provision of 49 CFR part 535 to remove the reference to trailers, consistent with the 2021 D.C. Circuit decision as discussed above.

D. 49 CFR 535.3 Applicability

1. 535.3 (a) Enforcement Action Related to Compliance With NHTSA Standards

NHTSA is proposing clarifications to its MDHD fuel efficiency program's applicability and compliance. More specifically, NHTSA is adding the clarification that manufacturers found not to comply with NHTSA's standards or regulations which apply to the construction of new and incomplete vehicles in 49 CFR parts 566 through 568 due to incorrect or fraudulent information will be subject to enforcement in accordance with Chapter 301 of Title 49 and deemed as not complying with Part 535. For example, if a manufacturer is unregistered with NHTSA as a manufacturer, as required by Part 566, or fails to affix an accurate certification label to a complete or incomplete vehicle, then the manufacturer concurrently violates both NHTSA's safety and fuel efficiency regulations. If the manufacturer is unable to correct its noncompliance(s), the manufacturer fails to comply with NHTSA's fuel efficiency program and is unable to earn fuel efficiency credits or must forfeit its credits, if already issued by NHTSA.

2. 535.3(d)(5) Exclusion of Heavy-Duty Trailers

NHTSA is proposing to delete 535.3(d)(5) consistent with the 2021 D.C. Circuit decision, discussed above.

3. 535.3(e)(1)(i) Vocational Vehicle Tire Speed Rating Exemption

NHTSA is proposing to update this section with a new applicability provision for vocational vehicles, to reflect the rulemaking intention and to be consistent with EPA regulations. The added provision allows for vocational vehicles with a date of manufacture before January 1, 2021 to automatically qualify for an exemption under 40 CFR 1037.631 if the tires installed on the vehicle have a maximum speed rating at or below 55 miles per hour.

4. 535.3(e)(1)(ii) Request for Exemption

NHTSA is proposing to add a second exemption clause to this section where vehicle manufacturers may request exemption under the EPA defined provisions found in 40 CFR 1037.631 and based on other criteria that are equivalent to those specified in 40 CFR 1037.631(a).

5. 535.3(e)(2)(ii) Early Certification for Small Manufacturers

Vehicle manufacturers that qualify as small businesses are exempt from the Phase 1 standards, but must meet the Phase 2 standards beginning January 1, 2022.

However, some vehicle families have been certified voluntarily to Phase 1 standards by small manufacturers. In an effort to encourage more voluntary early certification to Phase 1 standards, EPA finalized a new interim provision in 40 CFR 1037.150(y)(4) for small manufacturers that certify their entire U.S.-directed production volume to the Phase 1 standards for calendar year 2021 (

see

85 FR at 28150). These small manufacturers would be allowed to certify to the Phase 1 standards for model year 2022, instead of the otherwise applicable Phase 2 standards. The agencies believe that early compliance with the Phase 1 standards should more than offset any reduction in benefits that would otherwise be achieved from meeting Phase 2 standards starting January 1, 2022.

In December 2020, EPA proposed further revisions to the Phase 2 GEM Simulation Model in the December 2020 Notice of Proposed Rulemaking (NRPM) for technical amendments to the GHG Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty VehicleS. EPA's GEM model is released and can be found

https://www.epa.gov/regulations-emissions-vehicles-and-engines/greenhouse-gas-emissions-model-gem-medium-and-heavy-duty

which incorporates the revisions being considered.” (last accessed: May 11, 2022)

EPA stated that it believed that the magnitude of any impact on air quality would be small because of the low production volumes from these small business manufacturers.

The finalized provision also allows the Phase 1 compliance credits that small manufacturers generate from model year 2018 through 2022 vocational vehicles to be used through model year 2027. Under the existing regulations, all manufacturers that generate vehicle credits under the Phase 1 program can use these credits for compliance in the Phase 2 averaging, banking, and trading program, but these credits are only subject to a five-year credit life. As EPA stated in its final rule, the agencies believe that the limit on credit life can be problematic for small manufacturers with limited product lines which allows them less flexibility in averaging, and the longer credit life will provide them additional flexibility to ensure all their products are fully compliant by the time the Phase 2 standards are fully phased in for model year 2027.

EPA received no adverse comment to either proposal for small manufacturers in § 1037.150(y)(4) and, therefore, finalized the provisions. NHTSA is proposing to implement parallel changes by updating § 535.5(e)(2)(ii) with the same provisions which can be found at § 535.5(e)(2)(ii)(A) and § 535.5(e)(2)(ii)(B), respectively. These changes would also maintain program alignment across both agencies.

6. 535.3(e)(3)—Transitional Allowance for Trailers

NHTSA is proposing to delete 535.3(e)(3) consistent with the 2021 D.C. Circuit decision, discussed above.

7. 535.3(j) Potential Enforcement Actions for Incomplete, Incorrect or Fraudulent Information

NHTSA is proposing to add a new section to the program applicability regulations. This new section provides clarifications and potential outcomes under the NHTSA fuel efficiency program, if EPA denies, suspends or revokes, a manufacturer's certificate of conformity in accordance with 40 CFR 1036.255 or 1037.225, due to incomplete, incorrect or fraudulent information.

E. 49 CFR Part 535.4 Definitions

NHTSA is proposing adding and modifying several definitions to clarify the meaning of certain terms. Almost all of these definitions reference EPA regulatory definitions to ensure alignment of the NHTSA and EPA programs.

1. Adjustable Parameter

NHTSA is proposing to add the definition for

adjustable parameter

as having the meaning given in 40 CFR 1037.801.

2. Alternative Fuel Conversion

NHTSA is proposing to add the definition for

alternative fuel conversion

as having the meaning given in 40 CFR 85.502.

3. Averaging Sets

NHTSA is proposing to delete “long trailer” and “short trailer” in reference to averaging sets definition in HD program, consistent with the 2021 D.C. Circuit decision.

4. Certificate of Conformity

After receiving no adverse comments, EPA finalized clarifying statements related to the information submitted in an application for a certificate of conformity. These clarifying statements are related to determining the date of application submission and the submission date for any potential changes to applications that are deemed incomplete or amended. NHTSA is proposing to update its Certificate of Conformity definition in Part 535 to include the same language finalized by EPA because the clarifications are also applicable to NHTSA's fuel efficiency program. These changes would also maintain program alignment across the agencies.

5. Hybrid Engine, Hybrid Powertrain, and Hybrid Vehicle

NHTSA is proposing to revise its definition of hybrid engine or hybrid powertrain in 49 CFR part 535.4 to reference directly the EPA definition for these powertrain types found in 1037.801. EPA changed its definitions for “hybrid engine or powertrain” and “hybrid vehicle” to be consistent with the revised hybrid powertrain test procedures it recently finalized in part 1036 subpart F, and the definitions of “hybrid powertrain” and “mild hybrid” added to 40 CFR part 1036. NHTSA is proposing corresponding revisions to the Part 535 definitions that add examples of systems that qualify as hybrid engines or powertrains, specifically systems that recover kinetic energy and use it to power an electric heater in the aftertreatment.

6. Emission Data Engine

NHTSA is proposing to add the definition for

emission data engine

as having the meaning given in 40 CFR 1036.801.

7. Engine Configuration

NHTSA is proposing to add the definition for

engine configuration

as having the meaning given in 40 CFR 1036.801.

8. Flatbed Trailer

NHTSA is proposing to delete the definition of flatbed trailer, consistent with the 2021 D.C. Circuit decision.

9. Flexible Fuel

NHTSA is proposing to add the definition for

flexible fuel

as having the meaning given in 40 CFR 1036.801.

10. Fuel Type

NHTSA is proposing to add the definition for

fuel type

as having the meaning given in 40 CFR 1036.801.

11. Gear Ratio

NHTSA is proposing to add the definition for

gear ratio

as having the meaning given in 40 CFR 1036.801.

12. Greenhouse Gas

NHTSA is proposing to add the definition for

greenhouse gas

as having the meaning given in 40 CFR 1036.801.

13. Good Engineering Judgment

NHTSA is proposing to add the definition for

good engineering judgement

as having the meaning given in 40 CFR 1068.30.

14. Heavy-Duty Engine

NHTSA is proposing to add the definition for

heavy-duty engine

as having the meaning given in 40 CFR 1036.801 and 49 CFR part 523.

15. Hybrid

NHTSA is proposing to add the definition for

hybrid

as having the meaning given in 40 CFR 1036.801.

16. Identification Number

NHTSA is proposing to add the definition for

identification number

as having the meaning given in 40 CFR 1037.801.

17. Manufacturer

NHTSA is proposing to add the definition for

manufacturer

as having the meaning given in 40 CFR 1037.801.

18. Model Year

NHTSA is proposing revisions to the definition for

model year

as it pertains to vehicles and engine installations. NHTSA is also proposing to delete references to trailers in this definition, consistent with the 2021 D.C. Circuit decision.

19. Motor Vehicle

NHTSA is proposing to add the definition for

motor vehicle

as having the meaning given in 49 U.S.C. 32901.

20. Multi-Purpose

NHTSA is proposing to add the definition for

multi-purpose

as having the meaning given in 40 CFR 1037.801.

21. Neutral-Idle

NHTSA is proposing to add the definition for

neutral idle

as having the meaning given in 40 CFR 1037.801.

22. New Vehicles

NHTSA is proposing to add the definition for

new vehicles

as having the meaning given to “new motor vehicle” given in 40 CFR 1037.801.

23. Percent

NHTSA is proposing to add the definition for

percent

as having the meaning given in 40 CFR 1037.801.

24. Placed Into Service

NHTSA is proposing to add the definition for

placed into service

as having the meaning given in 40 CFR 1037.801.

25. Phase 2

NHTSA is proposing to delete reference to fuel efficiency and greenhouse gas emissions standards for trailer regulations, consistent with the 2021 D.C. Circuit decision.

26. Regulatory Subcategory

NHTSA is proposing to delete the section (4) reference to trailer subcategory, consistent with the 2021 D.C. Circuit decision.

27. Relating

NHTSA is proposing to add the definition for

relating

as having the meaning given in 40 CFR 1037.801.

28. Round

NHTSA is proposing to add the definition for

round

as having the meaning given in 40 CFR1065.1001.

29. Standard Payload

NHTSA is proposing to remove the definition of standard payload for trailers, consistent with the 2021 D.C. Circuit decision.

30. Standard Tractor

NHTSA is proposing to correct the definition for

standard tractor

as having

the meaning given in 40 CFR 1037.801 versus the currently defined 40 CFR 1037.501.

31. Standard Trailer

NHTSA is proposing to correct the definition for

standard trailer

as having the meaning given in 40 CFR 1037.801 versus the currently defined 40 CFR 1037.501.

32. Suspend

NHTSA is proposing to add the definition for

suspend

as having the meaning given in 40 CFR 1037.801.

33. Vehicle Service Class

NHTSA is proposing to revise the

vehicle service class

definition found in 49 CFR part 535.4 to directly reference EPA regulation 40 CFR 1037.140. NHTSA is proposing this revision to avoid redundancy across the agencies and align directly with EPA revisions finalized in their recent technical amendments rulemaking.

The recent EPA technical amendments clarify that the classification for tractors, where provisions are the same as vocational vehicles, are applicable to both hybrid and non-hybrid vehicles. The amendments also clarify that Class 8 hybrid and electric vehicles are Heavy HDVs while all other vehicles are classified by GVWR classes.

EPA explained in its final rule that prior to these revisions, manufacturers had expressed concern that the Phase 2 regulations were not specific enough regarding how to classify hybrid vocational vehicles, because vocational vehicles are generally classified by the class of the engines (as opposed to tractors, which are classified based on GVW), which was not applicable to electrically driven vehicles that have no engine.

34. Void

NHTSA is proposing to add the definition for

void

as having the meaning given in 40 CFR 1037.801.

F. 49 CFR Part 535.5 Standards

1. 49 CFR Part 535.5(a)

NHTSA is proposing to add clarification to the regulatory standards relating to heavy-duty pickup trucks and vans. More specifically, the agency is proposing adding language that ensures manufacturer options for EPA and NHTSA vehicle standards are aligned. Please refer to the proposed regulatory text for additional details.

2. 49 CFR Part 535.5(b)

NHTSA is proposing to add clarification to the regulatory standards relating to heavy-duty vocational vehicles. More specifically, the agency is proposing adding language that ensures manufacturer options for EPA and NHTSA vehicle standards are aligned. Please refer to the proposed regulatory text under this section for additional details.

3. 49 CFR Part 535.5(b)(1)

NHTSA is proposing deletion of the mandatory requirements for

all

heavy-duty vocational vehicles to be equipped tire pressure monitoring systems. The proposed revision, however, does not include removal of this mandatory requirement for motorhomes, as specified under 49 CFR part 535.5 (b)(6)(vi) and 49 CFR 571.138.

4. 49 CFR Part 535.5(b)(4)

NHTSA is proposing to correct the Vocational HHD Vehicle Regional compression ignition (CI) standards. The current published standard for this vehicle class is incorrect, and does not align with EPA GHG standards for this vehicle type. The incorrect values resulted from an incorrect calculation during the Phase 2 rulemaking which intended to maintain alignment of the NHTSA and EPA standards. The proposed corrected value for this regulatory class is 20.1375 gallons per 1000-ton miles vs. the currently published standard of 20.2358.

5. 49 CFR Part 535.5(c)

NHTSA is proposing to add clarification to the regulatory standards relating to truck tractors. More specifically, the agency is proposing adding language that ensures manufacturer options for EPA and NHTSA vehicle standards are aligned across both agencies. Please refer to the proposed regulatory text for additional details.

6. 49 CFR Part 535.5(c)(5)

NHTSA is proposing to revise its Alternate Fuel Consumption Standards for Tractors above 120,000 GCWR for 2021 model year and later. The revised standards are directly aligned with the revised GHG standards for this class of vehicles proposed and finalized by EPA as part of its technical amendments rulemaking.

The revised standards provide additional clarity on this vehicle class along with fuel efficiency standards that increase in three increments, model years 2021-2023, model years 2024-2026, model years 2026 and later.

https://www.epa.gov/regulations-emissions-vehicles-and-engines/greenhouse-gas-emissions-model-gem-medium-and-heavy-duty

which incorporates the revisions being considered.” (last accessed: May 11, 2022)

As described in EPA's final rulemaking action, the agencies originally defined these alternate fuel consumption and greenhouse-gas standards during the Phase 2 rulemaking, to enable Environment and Climate Change Canada (ECCC) to fully harmonize with the U.S.'s HD Phase 2 standards.

In the interim, ECCC has since adopted final standards for these 120,000 to 140,000 pound GCWR tractors, which differ from the optional standards finalized in Phase 2.

Since the purpose of these standards was to facilitate certification of vehicles intended for Canada, EPA proposed optional standards in 40 CFR 1037.670 that would be the same as the final ECCC standards, and did not receive any adverse comments regarding that proposal. NHTSA is proposing to adopt these alternative standards, in gallons per 1,000 ton-miles units, for 120,000 to 140,000-pound GCWR tractors that are equivalent to the EPA and ECCC standards. This would maintain harmonization across the programs for all three agencies.

Regulations Amending the Heavy-duty Vehicle and Engine Greenhouse Gas Emission Regulations and Other Regulations Made Under the Canadian Environmental Protection Act, 1999: SOR/2018-98, Canada Gazette, Part II, Volume 152, Number 11, May 16, 2018.

7. 49 CFR Part 535.5(d)

NHTSA is proposing to add clarifications in 49 CFR part 535.5(d) and 535.6(d) to expand its regulatory provision to optionally accommodate powertrain families and subfamilies added by EPA in 40 CFR 1036.108(a) and 1036.230(d) and (f). The EPA provisions allow manufacturers to apply CO

standards to powertrain families and subfamilies. They also allow manufacturers to optionally certify powertrains using the engine testing provisions in 40 CFR 1036 instead of 40 CFR 1037. Manufacturers may choose to include electric powertrain and hybrid electric powertrain emissions in their engine families or subfamilies under part 1036 instead of (or in addition to) the otherwise applicable engine fuel maps. Doing so would provide the same compliance options for manufacturers under the EPA and NHTSA programs.

8. 49 CFR Part 535.5(d)(3)

NHTSA is proposing to correct the Heavy-Duty Engine Fuel Consumption Standards for Phase 1 MHD and HHD compression ignition (CI) tractor engines. The current published standards for these engine classes are incorrect, and do not align with EPA GHG standards for these engine types. The incorrect values resulted from an incorrect calculation during the Phase 2 rulemaking which intended to maintain alignment of the NHTSA and EPA standards. The proposed correct values for these regulatory classes are 4.7839 gallons per 100 hp-hr for MHD CI tractor engines and 4.5187 gallons per 100 hp-hr for HHD CI tractor engines.

9. 49 CFR Part 535.5(d)(11)

NHTSA is proposing to correct the

Alternate transition option for Phase 2 engine standards

(A) and (C). The current published standards for these engine standards are incorrect, and do not align with current EPA GHG standards for these engine types. The incorrect values resulted from an incorrect calculation during the Phase 2 rulemaking which intended to maintain alignment for the NHTSA and EPA standards. The proposed corrected values for these regulatory classes are 5.3241 gallons per 100 hp-hr for MHD vocational vehicle engines and 5.0098 gallons per 100 hp-hr for HHD vocational engines.

10. 49 CFR Part 535.5(e)

NHTSA is proposing to delete 535.3(e), Heavy Duty Trailer, consistent with the 2021 D.C. Circuit decision, discussed above.

G. 49 CFR Part 535.6 Measurement and Calculation Procedures

1. 49 CFR Part 535.6(b)(1)

NHTSA is proposing to add a reference to EPA's finalized regulation 40 CFR 1037.150 to 49 CFR part 535.6(b)(1). This added reference would provide clear guidance that would be used to determine the proper vehicle and vehicle family to select when determining a manufacturer's regulatory subcategories for vocational vehicles and tractors. The addition would also maintain program alignment across the agencies.

2. 49 CFR Part 535.6(b)(4)(ii)

NHTSA is proposing to add a reference to EPA's finalized regulation 40 CFR 1037.525 to 49 CFR part 535.6(b)(4)(ii). This added reference would clarify how to determine a high-roof tractor's aerodynamic performance. EPA finalized this revision to more clearly relate the drag areas to the defined effective yaw variable, as recommended by EMA as a comment to the EPA proposal.

NHTSA is proposing to adopt this same measurement schema to keep programs aligned across the agencies.

The variables C

effective-yaw-coastdown

and C

effective-yaw-alt

are now C

coastdown

(ψ

eff

) and C

alt

(ψ

eff

), respectively.

3. 49 CFR Part 535.6(b)(5)(i)

NHTSA is proposing to revise 49 CFR part 535.6(b)(5)(i) to change the reference to an EPA regulation from 40 CFR 1036.510 to 1036.503. This revision would align the NHTSA regulations with the revised and finalized EPA regulations. This change would keep the programs of both agencies aligned.

4. 49 CFR Part 535.6(b)(5)(v)(E)

(3)

NHTSA is proposing to add a new requirement in 49 CFR part 535.6(b)(5)(v)(E)

(3)

that allows manufacturers to characterize torque converters to allow a manufacturer to determine their own torque converter capacity factor instead of using the default value provided in GEM. This change aligns with EPA provisions in 40 CFR 1037.570 and maintains program alignment across both agencies.

5. 49 CFR Part 535.6(b)(5)(v)(E)

(4)

NHTSA is proposing to add a new requirement in 49 CFR part 535.6(b)(5)(v)(E)

(4)

to allow vocational vehicles to input a value for neutral coasting in GEM as a compliance option for its fuel consumption program. This revision would align the NHTSA regulations with the EPA regulations in 40 CFR 1037.52 and keep both agencies aligned for program compliance.

6. 49 CFR Part 535.6(d)

Like 49 CFR part 535.5(d), NHTSA is proposing to add clarifications in NHTSA 535.6(d) to expand its regulatory provision to optionally accommodate powertrain families and subfamilies added by EPA in 40 CFR 1036.108(a) and 1036.230(d) and (f). The EPA provisions allow manufacturers to apply CO

7. 49 CFR Part 535.6(d)(1)

NHTSA is proposing a consolidation of references to EPA regulation 40 CFR 1036.501 for engines in heavy-duty truck tractors and vocational vehicles that make up each of the manufacturer's regulatory subcategories.

8. 49 CFR Part 535.6(d)(2)

Like 49 CFR part 535.6(d), NHTSA is proposing to add clarifications to 535.6(d)(2) that align with the EPA regulation 40 CFR 1036.230(f) and to expand this regulatory provision to accommodate powertrains other than engines and to also include sub-families.

9. 49 CFR Part 535.6(d)(3)

NHTSA is proposing to add a new section to 49 CFR part 535.6(d) to address medium and heavy heavy-duty engines. This new subsection (3) mirrors and references the recently finalized EPA technical amendment for 40 CFR 1036.501 addressing the same regulatory items. Subsequently, existing sections 49 CFR part 535.6(d)(3) and 49 CFR part 535.6(d)(4) would be incremented by one as a result of inserting this new section, resulting in the existing 49 CFR part 535.6(d)(3) becoming 49 CFR part 535.6(d)(4), and the existing 49 CFR part 535.6(d)(4) becoming 49 CFR part 535.6(d)(5).

10. 49 CFR Part 535.6(d)(3)(ii)

NHTSA is proposing to add clarifications to 49 CFR part 535.6(d)(3)(ii) that expand this regulatory provision to accommodate powertrains other than engines and to also include sub-families.

11. 49 CFR Part 535.6(e)

NHTSA is proposing to delete 49 CFR part 535.6(e) reference to heavy duty trailer, consistent with the 2021 D.C. Circuit decision.

H. 49 CFR 535.7 Averaging, Banking, and Trading (ABT) Credit Program

1. 49 CFR Part 535.7(a)

NHTSA is proposing to delete reference to trailer manufacturers, consistent with the 2021 D.C. Circuit decision.

2. 49 CFR Part 535.7(a)(2)(v)

NHTSA is proposing to delete reference to application of using bank or trade credit to trailer, consistent with the 2021 D.C. Circuit decision.

3. 49 CFR Part 535.7(a)(3)(v)

NHTSA is proposing to delete reference to trailer manufacturers generating credits, consistent with the 2021 D.C. Circuit decision.

4. 49 CFR part 535.7(a)(4)

NHTSA is clarifying its requirements for trading fuel consumption credits. Tractor, vocational vehicle and engine manufacturers may trade credits generated for vehicle or engine families or subfamilies while manufacturers of heavy-duty pickup trucks and vans certified as complete vehicles may trade credits generated for averaging sets. NHTSA is also proposing to delete reference to trading credits earned for compliance with trailer regulations, consistent with the 2021 D.C. Circuit decision.

5. 49 CFR Part 535.7(a)(4)(v)

NHTSA is proposing to delete reference to trailer manufacturers generating credits starting in model year 2027 may not bank or trade credits, consistent with the 2021 D.C. Circuit decision.

6. 49 CFR Part 535.7(a)(8)

The agency is proposing additions to the credit calculation provisions and to the calculations used for vocational vehicles transitioning to Phase 2 standards. More specifically, NHTSA is proposing to mirror the crediting provisions finalized by EPA as part of their technical amendments rulemaking. These added provisions include extending credit life, allowing off-cycle credits, allowing credit values for automatic tire inflation systems, and allowing automatic engine shutdown systems.

7. 49 CFR Part 535.7(a)(9)(iv)(B)

NHTSA is proposing to provide clarifications regarding production limits for drayage tractors under the custom chassis allowance, and how it relates to corporate relationships regarding averaging, banking and trading of credits.

8. 49 CFR Part 535.7(a)(11)

NHTSA is proposing regulatory provisions that prevent the calculation of any Phase 1 fuel consumption credits more than once for compliance unless the regulations explicitly allow it.

9. 49 CFR Part 535.7(b)(1)

NHTSA is proposing to amend the Total MY Fleet FCC equation because the current CFR shows an incorrect equation.

10. 49 CFR Part 535.7(c)(1)

NHTSA is proposing to amend the Vehicle Family FCC equation because the current CFR shows an incorrect equation.

11. 49 CFR Part 535.7(d)(1)

NHTSA is proposing to amend the Engine Family FCC equation because the current CFR shows an incorrect equation.

12. 49 CFR Part 535.7(d)(7)(ii)

NHTSA is proposing to the remove the usage restrictions associated with model year 2021 and earlier vocational engine credits. Manufacturers may use Phase 1 credits in the Phase 2 program using an adjustment factor to prorate credits to compensate for changes in the technologies and drive cycles used in developing the Phase 2 standards. NHTSA is also correcting the adjustment factor values used for the conversion to fuel consumption values in terms of gallons/100 hp-hr versus the currently published grams of CO

reference values.

13. 49 CFR 535.7(e)

NHTSA is proposing to delete 535.7(e), ABT Provision for Trailers, consistent with the 2021 D.C. Circuit decision, discussed above.

14. 49 CFR 535.7(f)(2)(v)

NHTSA is proposing to delete the provision formerly labeled as 535.7(f)(2)(v) reference to application of off-cycle provision to trailers, consistent with the 2021 D.C. Circuit decision, discussed above.

I. 49 CFR 535.8 Reporting and Recordkeeping Requirements

1. 49 CFR Part 535.8(a)(6)

NHTSA is proposing to amend the address to 1200 New Jersey Avenue, NVS-200, Office W45-306, SE, Washington, DC 20590, because the current CFR shows an incorrect address.

2. 49 CFR Part 535.8(b)(11)(i)(C)

Like 49 CFR part 535.6(d), NHTSA is proposing to add clarifications to 49 CFR part 535.8(b)(11)(i)(C) that expand this regulatory provision to accommodate powertrains other than engines and to also include sub-families.

3. 49 CFR Part 535.8(c)(13)(h)(i)

NHTSA is proposing additions to this reporting requirement that clarify potential enforcement actions associated with the submission of information that is fraudulent or grossly negligent or otherwise provided in bad faith.

4. 49 CFR Part 535.8(g)(12)

NHTSA is proposing to delete reference to requirements for trailer manufacturers, consistent with the 2021 D.C. Circuit decision, discussed above.

J. 49 CFR 535.9 Enforcement Approach

1. 49 CFR Part 535.9(a)(1)(i)

NHTSA is proposing additional language and clarifications that NHTSA will perform confirmatory testing and collaborate with EPA regarding any potential issues with testing results.

2. 49 CFR Part 535.9(a)(1)(v)

NHTSA is proposing additional language and clarifications with respect to any GEM inputs in a manufacturer's application for certification or in the end of the year ABT final reports. The proposed revisions include streamlining references to EPA regulations.

K. 49 CFR 535.10 How do manufacturers comply with fuel consumption standards?

1. 49 CFR Part 535.10(a)(3)

NHTSA is clarifying that EPA's compliance requirements 40 CFR 1037.601 and 40 CFR part 1068 apply similarly to NHTSA's fuel consumption program, except for the warranty provisions in 40 CFR 1037.601(a)(5).

2. 49 CFR Part 535.10(a)(6)

NHTSA is proposing the addition of language clarifying that vehicles required to meet the fuel consumption standards of this part must also comply with the same requirements as specified in the EPA regulation 40 CFR 1037.115.

3. 49 CFR Part 535.10(c)

NHTSA is proposing to delete the 535.10(c)(2) reference to box trailers, as well as the 535.10(c)(3) reference to manufacturer's compliance if their trailer meet specified standards, consistent with the 2021 D.C. Circuit decision, discussed above.

III. Statutory Authority and Executive Order Reviews

A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review

This action is not a significant regulatory action and was therefore not submitted to the Office of Management and Budget (OMB) for review.

B. Paperwork Reduction Act (PRA)

This action does not impose any new information collection burden under the PRA. OMB has previously approved the information collection activities

contained in the existing regulations and has assigned OMB control numbers 2060-0104, 2060-0287, 2060-0338, 2060-0545, 2060-0641. This rule clarifies and simplifies procedures without affecting information collection requirements.

C. Regulatory Flexibility Act (RFA)

I certify that this action would not have a significant economic impact on a substantial number of small entities under the RFA. In making this determination, the impact of concern is any significant adverse economic impact on small entities. An agency may certify that a rule will not have a significant economic impact on a substantial number of small entities if the rule relieves regulatory burden, has no net burden or otherwise has a positive economic effect on the small entities subject to the rule. This proposed action is designed to reduce testing burdens, increase compliance flexibility, and make various corrections and adjustments to compliance provisions. We therefore anticipate no costs and no regulatory burden associated with this proposed rule. We have concluded that this proposed action will have no significant increase in regulatory burden for directly regulated small entities.

D. Unfunded Mandates Reform Act (UMRA)

This action does not contain any unfunded mandate as described in UMRA, 2 U.S.C. 1531-1538, and does not significantly or uniquely affect small governments. The proposed action imposes no enforceable duty on any state, local or tribal governments. Requirements for the private sector do not exceed $100 million in any one year.

E. National Environmental Policy Act (NEPA)

NHTSA has analyzed this proposed rule for the purposes of the National Environmental Policy Act. The agency has determined that implementation of this action will not have any significant impact on the quality of the human environment.

F. Executive Order 13132: Federalism

This action does not have federalism implications. It will not have substantial direct effects on the states, on the relationship between the national government and the states, or on the distribution of power and responsibilities among the various levels of government.

G. Executive Order 13175: Consultation and Coordination With Indian Tribal Governments

This action does not have tribal implications as specified in Executive Order 13175. This proposed rule will be implemented at the Federal level and affects engine and vehicle manufacturers. Thus, Executive Order 13175 does not apply to this action.

H. Executive Order 13045: Protection of Children From Environmental Health Risks and Safety Risks

This action is not subject to Executive Order 13045 because it is not economically significant as defined in Executive Order 12866, and because there are no environmental health or safety risks created by this action that could present a disproportionate risk to children.

I. Executive Order 13211: Actions Concerning Regulations That Significantly Affect Energy Supply, Distribution or Use

This action is not a “significant energy action” because it is not likely to have a significant adverse effect on the supply, distribution, or use of energy. We have concluded that this action is not likely to have any adverse energy effects because it is designed merely to reduce testing burdens, increase compliance flexibility, and make various corrections and adjustments to compliance provisions.

J. National Technology Transfer and Advancement Act (NTTAA)

Section 12(d) of the National Technology Transfer and Advancement Act of 1995 (“NTTAA”), Public Law 104-113, 12(d) (15 U.S.C. 272 note) directs EPA to use voluntary consensus standards in its regulatory activities unless to do so would be inconsistent with applicable law or otherwise impractical. Voluntary consensus standards are technical standards (

e.g.,

materials specifications, test methods, sampling procedures, and business practices) that are developed or adopted by voluntary consensus standards bodies. NTTAA directs agencies to provide Congress, through OMB, explanations when the Agency decides not to use available and applicable voluntary consensus standards. This action involves technical standards.

K. Executive Order 12898: Federal Actions To Address Environmental Justice in Minority Populations and Low-Income Populations

NHTSA believes this action does not have disproportionately high and adverse human health or environmental effects on minority populations, low-income populations or indigenous peoples, as specified in Executive Order 12898 (59 FR 7629, February 16, 1994). Due to the lack of environmental impact, these proposed regulatory changes will not have a disproportionate adverse effect on minority populations, low-income populations, or indigenous peoples.

IV. Regulatory Text

List of Subjects in 49 CFR Part 535

Energy conservation, Fuel, Fuel economy, Motor vehicles.

For the reasons discussed in the preamble, the National Highway Traffic Safety Administraton proposes to amend 49 CFR part 535 as follows:

1. Revise Part 535 to read as follows:

PART 535—MEDIUM- AND HEAVY-DUTY VEHICLE FUEL EFFICIENCY PROGRAM

Sec.

535.1

Scope.

535.2

Purpose.

535.3

Applicability.

535.4

Definitions.

535.5

Standards.

535.6

Measurement and calculation procedures.

535.7

Averaging, banking, and trading (ABT) credit program.

535.8

Reporting and recordkeeping requirements.

535.9

Enforcement approach.

535.10

How do manufacturers comply with fuel consumption standards?

Authority:

49 U.S.C. 32902.

§ 535.1

Scope.

This part establishes fuel consumption standards pursuant to 49 U.S.C. 32902(k) for work trucks and commercial medium- and heavy-duty on-highway vehicles (hereafter referenced as heavy-duty vehicles), and engines manufactured for sale in the United States. This part establishes a credit program manufacturers may use to comply with standards and requirements for manufacturers to provide reports to the National Highway Traffic Safety Administration regarding their efforts to reduce the fuel consumption of heavy-duty vehicles and engines.

§ 535.2

Purpose.

The purpose of this part is to reduce the fuel consumption of new heavy-duty vehicles and engines by establishing maximum levels for fuel consumption standards while providing a flexible credit program to assist manufacturers in complying with standards.

§ 535.3

Applicability.

(a) This part applies to manufacturers that produce complete and incomplete heavy-duty vehicles as defined in 49 CFR part 523, and to the manufacturers of all heavy-duty engines manufactured for use in the applicable vehicles for each given model year. Incomplete vehicle manufacturers must comply with NHTSA's safety requirements in 49 CFR parts 565, 567 and 568 to comply with part 535. Manufacturers found under this program not to comply with NHTSA's safety standards or regulations which apply to the construction of new and incomplete vehicles in 49 CFR parts 566 through 568 due to incorrect or fraudulent information will be subject to enforcement in accordance with Chapter 301 of Title 49 and deemed as not complying with Part 535. If the manufacturer is unable to correct its noncompliance with NHTSA, the manufacturer fails to comply with the fuel efficiency program and is unable to earn fuel efficiency credits.

(b) This part also applies to alterers, final stage manufacturers, and intermediate manufacturers producing vehicles and engines or assembling motor vehicles or motor vehicle equipment under special conditions. Manufacturers comply with this part by following the special conditions in 40 CFR 1037.620, 1037.621, and 1037.622 in which EPA allows manufacturer to:

(1) Share responsibility for the vehicles they produce. Manufacturers sharing responsibility for complying with emissions and fuel consumption standards must submit to the agencies a joint agreement as specified in 49 CFR 534.8(a);

(2) Have certificate holders sell or ship vehicles that are missing certain emission-related components to be installed by secondary vehicle manufacturers;

(3) Ship partially complete vehicles to secondary manufacturers;

(4) Build electric vehicles; and

(5) Build alternative fueled vehicles from all types of heavy-duty engine conversions. The conversion manufacturer must:

(i) Install alternative fuel conversion systems into vehicles acquired from vehicle manufacturers prior to first retail sale or prior to the vehicle's introduction into interstate commerce.

(ii) Be designated by the vehicle manufacturer and EPA to be the certificate holder.

(iii) Omit alternative fueled vehicles from compliance with vehicle fuel consumption standards, if-

(A) Excluded from EPA emissions standards; and

(B) A reasonable technical basis exist that the modified vehicle continues to meet emissions and fuel consumption vehicle standards.

(c) Vehicle and engine manufacturers that must comply with this part include manufacturers required to have approved certificates of conformity from EPA as specified in 40 CFR parts 86, 1036, and 1037.

(d) The following heavy-duty vehicles and engines are excluded from the requirements of this part:

(1) Vehicles and engines manufactured prior to January 1, 2014, unless certified early under NHTSA's voluntary provisions in § 535.5.

(2) Medium-duty passenger vehicles and other vehicles subject to the light-duty corporate average fuel economy standards in 49 CFR parts 531 and 533.

(3) Recreational vehicles, including motor homes manufactured before January 1, 2021, except those produced by manufacturers voluntarily complying with NHTSA's early vocational standards for model years 2013 through 2020.

(4) Aircraft vehicles meeting the definition of “motor vehicle”. For example, this would include certain convertible aircraft that can be adjusted to operate on public roads.

(5) Engines installed in heavy-duty vehicles that are not used to propel vehicles. Note, this includes engines used to indirectly propel vehicles (such as electrical generator engines that power to batteries for propulsion).

(6) The provisions of this part do not apply to engines that are not internal combustion engines. For example, the provisions of this part do not apply to fuel cells. Note that gas turbine engines are internal combustion engines.

(e) The following heavy-duty vehicles and engines are exempted from the requirements of this part:

(1) Off-road vehicles. Vehicle manufacturers producing vehicles intended for off-road may exempt vehicles without requesting approval from the agencies subject to the criteria in § 535.5(b)(9)(i) and 40 CFR 1037.631(a). If unusual circumstances exist and a manufacturer is uncertain as to whether its vehicles qualify, the manufacturer should ask for a preliminary determination from the agencies before submitting its application for certification in accordance with 40 CFR 1037.205 for the applicable vehicles. Send the request with supporting information to EPA and the agencies will coordinate in making a preliminary determination as specified in 40 CFR 1037.210. These decisions are considered to be preliminary approvals and subject to final review and approval.

(i) Vocational vehicles with a date of manufacture before January 1, 2021 automatically qualify for an exemption under § 1037.631 if the tires installed on the vehicle have a maximum speed rating at or below 55 miles per hour.

(ii) In unusual circumstances, vehicle manufacturers may ask EPA and NHTSA to exempt vehicles under § 1037.631 based on other criteria that are equivalent to those specified in § 1037.631(a); however, the agencies will normally not grant relief in cases where the vehicle manufacturer has credits or can otherwise comply with applicable standards. Manufacturers should request approval for an exemption before producing the subject vehicles. Send your request with supporting information to the Designated Compliance Officer; EPA will coordinate in making a determination under § 1037.210. If the manufacturer introduces into U.S. commerce vehicles that depend on our approval under this paragraph (h) of this section before we inform you of our approval, those vehicles violate 40 CFR 1068.101(a)(1) and 40 CFR 535.9.

(2) Small business manufacturers.

(i) For Phase 1, small business manufacturers are exempted from the vehicle and engine standards of § 535.5, but must comply with the reporting requirements of § 535.8(g).

(ii) For Phase 2, fuel consumption standards apply on a delayed schedule for manufacturers meeting the small business criteria specified in 13 CFR 121.201 and in 40 CFR 86.1819- 14(k)(5), 40 CFR 1036.150, and 40 CFR 1037.150. Qualifying manufacturers of truck tractors, vocational vehicles, heavy duty pickups and vans, and engines are not subject to the fuel consumption standards for vehicles built before January 1, 2022 and engines (such as those engines built by small alternative fuel engine converters) with a date of manufacturer on or after November 14, 2011 and before January 1, 2022. Qualifying manufacturers may choose to voluntarily comply early.

(A) Small manufacturers that certify their entire U.S.-directed production volume to the Phase 1 standards for calendar year 2021 may certify to the Phase 1 standards for model year 2022 (instead of the otherwise applicable Phase 2 standards).

(B) Phase 1 vehicle credits small manufacturers generate under provision (A) of this section for model year 2018 through 2022 vocational vehicles may be used through model year 2027 (instead of being subject to a five-year credit life).

(iii) Small business manufacturers producing vehicles and engines that run on any fuel other than gasoline, E85, or diesel fuel meeting the criteria specified in 13 CFR 121.201 and in 40 CFR 86.1819-14(k)(5), 40 CFR 1036.150, and 40 CFR 1037.150 may delay complying with every new mandatory standard under this part by one model year.

(3) Engines for specialty vehicles. Engines certified to the alternative standards specified in 40 CFR 86.007-11 and 86.008-10 for use in specialty vehicles as described in 40 CFR 1037.605. Compliance with the vehicle provisions in 40 CFR 1037.605 satisfies compliance for NHTSA under this part.

(f) For model year 2021 and later, vocational vehicle manufacturers building custom chassis vehicles (

e.g.,

emergency vehicles) may be exempted from standards in § 535.5(b)(4) and may comply with alternative fuel consumption standards as specified in § 535.5(b)(6). Manufacturers complying with alternative fuel consumption standards in § 535.5(b)(6) are restricted in using fuel consumption credits as specified in § 535.7(c).

(g) The fuel consumption standards in some cases apply differently for spark-ignition and compression-ignition engines or vehicles as specified in 40 CFR parts 1036 and 1037. Engine requirements are similarly differentiated by engine type and by primary intended service class, as described in 40 CFR 1036.140.

(h) NHTSA may exclude or exempt vehicles and engines under special conditions allowed by EPA in accordance with 40 CFR parts 85, 86, 1036, 1037, 1039, and 1068. Manufacturers should consult the agencies if uncertain how to apply any EPA provision under the NHTSA fuel consumption program. It is recommended that manufacturers seek clarification before producing a vehicle. Upon notification by EPA of a fraudulent use of an exemption, NHTSA reserves that right to suspend or revoke any exemption or exclusion.

(i) In cases where there are differences between the application of this part and the corresponding EPA program regarding whether a vehicle is regulated or not (such as due to differences in applicability resulting from differing agency definitions, etc.), manufacturers should contact the agencies to identify these vehicles and assess the applicability of the agencies' standards. The agencies will provide guidance on how the vehicles can comply. Manufacturers are required to identify these vehicles in their final reports submitted in accordance with § 535.8.

(j) If EPA denies, suspends or revokes, a manufacturer's certificate of conformity in accordance with 40 CFR 1036.255 or 1037.225, due to incomplete, incorrect or fraudulent information, the vehicles or engines covered by the applicable certificate will be:

(1) ineligible to participate in the NHTSA fuel consumption program if the certificate is denied.

(2) eligible only for partial crediting under § 535.7, for the population of vehicles or engines which the certificate remains in effect before the date of the suspension. The population of vehicle or engines after the suspension may also be subject to possible fines in accordance with § 535.9.

(3) ineligible for crediting under § 535.7, and subject to possible fines in accordance with § 535.9 if fraud exists.

(4) If NHTSA finds a manufacturer has submitted incomplete, incorrect or fraudulent information, it will contact EPA to deliberate and determine the appropriate enforcement action.

§ 535.4

Definitions.

The terms manufacture and manufacturer are used as defined in section 501 of the Act and the terms commercial medium-duty and heavy-duty on highway vehicle, fuel and work truck are used as defined in 49 U.S.C. 32901. See 49 CFR 523.2 for general definitions related to NHTSA's fuel efficiency programs.

Act

means the Motor Vehicle Information and Cost Savings Act, as amended by Public Law 94-163 and 96-425.

Adjustable parameter

has the meaning given in 40 CFR 1037.801.

Administrator

means the Administrator of the National Highway Traffic Safety Administration (NHTSA) or the Administrator's delegate.

Advanced technology

means vehicle technology under this fuel consumption program in § 535.6 and 535.7 and by EPA under 40 CFR 86.1819-14(d)(7), 1036.615, or 1037.615.

Alterers

means a manufacturer that modifies an altered vehicle as defined in 49 CFR 567.3.

Alternative fuel conversion

has the meaning given for clean alternative fuel conversion in 40 CFR 85.502.

Alternative fuel conversion

has the meaning given in 40 CFR 85.502.

A to B testing

has the meaning given in 40 CFR 1037.801.

Automated manual transmission

has the meaning given in 40 CFR 1037.801.

Automatic tire inflation system

has the meaning given in 40 CFR 1037.801.

Automatic transmission (AT)

has the meaning given in 40 CFR 1037.801.

Auxiliary power unit

has the meaning given in 40 CFR 1037.801.

Averaging set

means, a set of engines or vehicles in which fuel consumption credits may be exchanged. Credits generated by one engine or vehicle family may only be used by other respective engine or vehicle families in the same averaging set as specified in § 535.7. Note that an averaging set may comprise more than one regulatory subcategory. The averaging sets for this HD program are defined as follows:

(1) Heavy-duty pickup trucks and vans.

(2) Light heavy-duty (LHD) vehicles.

(3) Medium heavy-duty (MHD) vehicles.

(4) Heavy heavy-duty (HHD) vehicles.

(5) Light heavy-duty engines subject to compression-ignition standards.

(6) Medium heavy-duty engines subject to compression-ignition standards.

(7) Heavy heavy-duty engines subject to compression-ignition standards.

(8) Engines subject to spark-ignition standards.

(9) Vehicle types certifying to optional custom chassis standards as specified in § 535.5(b)(6) form separate averaging sets for each vehicle type as specified in § 535.7(c).

Axle ratio or Drive axle ratio, ka

has the meaning given in 40 CFR 1037.801.

Basic vehicle frontal area

has the meaning given in 40 CFR 1037.801.

Cab-complete vehicle

has the meaning given in 49 CFR 523.2.

Carryover

has the meaning given in 40 CFR 1037.801.

Certificate holder

means the manufacturer who holds the certificate of conformity for the vehicle or engine and that assigns the model year based on the date when its manufacturing operations are completed relative to its annual model year period.

Certificate of Conformity

means an approval document granted by EPA to a manufacturer that submits an application for a vehicle or engine emissions family in 40 CFR 1036.205 and 1037.205. A certificate of conformity is valid from the indicated effective date until December 31 of the model year for which it is issued. The certificate must be renewed annually for any vehicle a manufacturer continues to produce. Information included in an amended application made in accordance with 40 CFR part 1036.225 and 1037.225, before the end of the model year applies similarly to the NHTSA fuel consumption program as to the EPA. If a manufacturer amends its application to make the amended application correct and complete, these changes do not apply retroactively to

the NHTSA fuel efficiency program. Also, if EPA or NHTSA determines that the manufacturer's amended application is not correct and complete, or otherwise does not conform to its regulations, any changes finalized by EPA or if EPA suspends, revokes, or voids a certification, also applies to the NHTSA fuel efficiency program. See § 535.3(j).

Certification

has the meaning given in 40 CFR 1037.801.

Certified emission level

has the meaning given in 40 CFR 1036.801.

Chassis-cab

means the incomplete part of a vehicle that includes a frame, a completed occupant compartment and that requires only the addition of cargo-carrying, work-performing, or load- bearing components to perform its intended functions.

Chief Counsel

means the NHTSA Chief Counsel, or his or her designee.

Class

means relating to GVWR classes for vehicles other than trailers, as follows:

(1) Class 2b vehicles

are vehicles with a gross vehicle weight rating (GVWR) ranging from 8,501 to 10,000 pounds.

(2) Class 3 through Class 8 vehicles

are vehicles with a gross vehicle weight rating (GVWR) of 10,001 pounds or more as defined in 49 CFR 565.15.

Complete sister vehicle

is a complete vehicle of the same configuration as a cab-complete vehicle.

Complete vehicle

has the meaning given in 49 CFR part 523.

Compression-ignition (CI)

means relating to a type of reciprocating, internal-combustion engine, such as a diesel engine, that is not a spark-ignition engine. Note, in accordance with 40 CFR 1036.1, gas turbine engines and other engines not meeting the definition of compression-ignition are deemed to be compression-ignition engines for complying with fuel consumption standards.

Configuration

means a subclassification within a test group for passenger cars, light trucks and medium-duty passenger vehicles and heavy-duty pickup trucks and vans which is based on basic engine, engine code, transmission type and gear ratios, and final drive ratio.

Container chassis trailer

has the same meaning as container chassis in 40 CFR 1037.801.

Curb weight

has the meaning given in 40 CFR 86.1803.

Custom chassis vehicle

means a vocational vehicle that is a motor home, school bus, refuse hauler, concrete mixer, emergency vehicle, mixed-use vehicle or other buses that are not school buses or motor coaches. These vehicle types are defined in 49 CFR 523.3. A “mixed-use vehicle” is one that meets at least one of the criteria specified in 40 CFR 1037.631(a)(1) or at least one of the criteria in 40 CFR 1037.631(a)(2), but not both.

Date of manufacture

means the date on which the certifying vehicle manufacturer completes its manufacturing operations, except as follows:

(1) Where the certificate holder is an engine manufacturer that does not manufacture the complete or incomplete vehicle, the date of manufacture of the vehicle is based on the date assembly of the vehicle is completed.

(2) EPA and NHTSA may approve an alternate date of manufacture based on the date on which the certifying (or primary) vehicle manufacturer completes assembly at the place of main assembly, consistent with the provisions of 40 CFR 1037.601 and 49 CFR 567.4.

(3) A vehicle manufacturer that completes assembly of a vehicle at two or more facilities may ask to use as the month and year of manufacture, for that vehicle, the month and year in which manufacturing is completed at the place of main assembly, consistent with provisions of 49 CFR 567.4, as the model year. Note that such staged assembly is subject to the provisions of 40 CFR 1068.260(c). NHTSA's allowance of this provision is effective when EPA approves the manufacturer's certificates of conformity for these vehicles.

Day cab

has the meaning given in 40 CFR 1037.801.

Drayage tractor

has the meaning given in 40 CFR 1037.801.

Dual-clutch transmission (DCT)

means a transmission has the meaning given in 40 CFR 1037.801.

Dual-fuel

has the meaning given in 40 CFR 1037.801.

Electric vehicle

has the meaning given in 40 CFR 1037.801.

Emergency vehicle

means a vehicle that meets one of the criteria in 40 CFR 1037.801.

Emission data engine

has the meaning given in 40 CFR 1036.801.

Engine configuration

has the meaning given in 40 CFR 1036.801.

Engine family

has the meaning given in 40 CFR 1036.230. Manufacturers designate families in accordance with EPA provisions and may not choose different families between the NHTSA and EPA programs.

Excluded

means a vehicle or engine manufacturer or component is not required to comply with any aspects with the NHTSA fuel consumption program.

Exempted

means a vehicle or engine manufacturer or component is not required to comply with certain provisions of the NHTSA fuel consumption program.

Family certification level (FCL)

has the meaning given in 40 CFR 1036.801.

Family emission limit (FEL)

has the meaning given in 40 CFR 1037.801.

Final drive ratio

has the meaning given in 40 CFR 1037.801.

Final-stage manufacturer

has the meaning given in 49 CFR 567.3 and includes secondary vehicle manufacturers as defined in 40 CFR 1037.801.

Fleet

in this part means all the heavy-duty vehicles or engines within each of the regulatory sub- categories that are manufactured by a manufacturer in a particular model year and that are subject to fuel consumption standards under § 535.5.

Fleet average fuel consumption

is the calculated average fuel consumption performance value for a manufacturer's fleet derived from the production weighted fuel consumption values of the unique vehicle configurations within each vehicle model type that makes up that manufacturer's vehicle fleet in a given model year. In this part, the fleet average fuel consumption value is determined for each manufacturer's fleet of heavy-duty pickup trucks and vans.

Fleet average fuel consumption standard

is the actual average fuel consumption standard for a manufacturer's fleet derived from the production weighted fuel consumption standards of each unique vehicle configuration, based on payload, tow capacity and drive configuration (2, 4 or all- wheel drive), of the model types that makes up that manufacturer's vehicle fleet in a given model year. In this part, the fleet average fuel consumption standard is determined for each manufacturer's fleet of heavy-duty pickup trucks and vans.

Flexible-fuel

has the meaning given in 40 CFR 1036.801.

Fuel cell

means an electrochemical cell that produces electricity via the non-combustion reaction of a consumable fuel, typically hydrogen.

Fuel cell electric vehicle

means a motor vehicle propelled solely by an electric motor where energy for the motor is supplied by a fuel cell.

Fuel efficiency

means the amount of work performed for each gallon of fuel consumed.

Fuel type

has the meaning given in 40 CFR 1037.801.

Gaseous fuel

has the meaning given in 40 CFR 1037.801.

Gear ratio

Transmission gear ratio,

kg, has the meaning given in 40 CFR 1037.801.

Good engineering judgment

has the meaning given in 40 CFR 1068.30. See 40 CFR 1068.5 for the administrative process used to evaluate good engineering judgement.

Greenhouse gas

has the meaning given in 40 CFR 1036.801.

Greenhouse gas Emissions Model (GEM)

has the meaning given in 40 CFR 1037.801.

Gross axle weight rating (GAWR)

has the meaning given in 49 CFR 571.3.

Gross combination weight rating (GCWR)

has the meaning given in 49 CFR 571.3.

Gross vehicle weight rating (GVWR)

has the meaning given in 49 CFR 571.3.

Heavy-duty off-road vehicle

means a heavy-duty vocational vehicle or vocational tractor that is intended for off-road use.

Heavy-duty engine

has the meaning given in 40 CFR 1036.801 and 49 CFR part 523.

Heavy-duty vehicle

has the meaning given in 40 CFR 1036.801 and 49 CFR part 523.

Heavy-haul tractor

has the meaning given in 40 CFR 1037.801 and 49 CFR part 523.

Heavy heavy-duty (HHD) vehicle

has the meaning given in vehicle service class.

Hybrid

has the meaning given in 40 CFR 1036.801.

Hybrid engine or hybrid powertrain

has the meaning given in 40 CFR 1037.801.

Hybrid vehicle

has the meaning given in 40 CFR 1037.801.

Identification number

has the meaning given in 40 CFR 1037.801.

Idle operation

has the meaning given in 40 CFR 1037.801.

Incomplete vehicle

has the meaning given in 49 CFR part 523. For the purpose of this regulation, a manufacturer may request EPA and NHTSA to allow the certification of a vehicle as an incomplete vehicle if it manufactures the engine and sells the unassembled chassis components, provided it does not produce and sell the body components necessary to complete the vehicle.

Innovative technology

means technology certified under § 535.7 and by EPA under 40 CFR 86.1819-14(d)(13), 1036.610, and 1037.610 in the Phase 1 program.

Intermediate manufacturer

has the meaning given in 49 CFR 567.3.

Light heavy-duty (LHD) vehicle

has the meaning given in vehicle service class.

Liquefied petroleum gas (LPG)

has the meaning given in 40 CFR 1036.801.

Low rolling resistance tire

means a tire on a vocational vehicle with a tire rolling resistance level (TRRL) of 7.7 kg/metric ton or lower, a steer tire on a tractor with a TRRL of 7.7 kg/metric ton or lower, or a drive tire on a tractor with a TRRL of 8.1 kg/metric ton or lower.

Manual transmission (MT)

has the meaning given in 40 CFR 1037.801.

Manufacturer

has the meaning given in 40 CFR 1036.801.

Medium heavy-duty (MHD) vehicle

has the meaning given in vehicle service class.

Model type

has the meaning given in 40 CFR 600.002.

Model year

as it applies to vehicles means:

(1) For tractors and vocational vehicles with a date of manufacture on or after January 1, 2021, the vehicle's

model year

is the calendar year corresponding to the date of manufacture; however, the vehicle's model year may be designated to be the year before the calendar year corresponding to the date of manufacture if the engine's model year is also from an earlier year. Note that paragraph (2) of this definition limits the extent to which vehicle manufacturers may install engines built in earlier calendar years. Note that 40 CFR 1037.601(a)(2) limits the extent to which vehicle manufacturers may install engines built in earlier calendar years.

(2) For Phase 1 tractors and vocational vehicles with a date of manufacture before January 1, 2021,

model year

means the manufacturer's annual new model production period, except as restricted under this definition. It must include January 1 of the calendar year for which the model year is named, may not begin before January 2 of the previous calendar year, and it must end by December 31 of the named calendar year. The model year may be set to match the calendar year corresponding to the date of manufacture.

(i) The manufacturer who holds the certificate of conformity for the vehicle must assign the model year based on the date when its manufacturing operations are completed relative to its annual model year period. In unusual circumstances where completion of your assembly is delayed, we may allow you to assign a model year one year earlier, provided it does not affect which regulatory requirements will apply.

(ii) Unless a vehicle is being shipped to a secondary manufacturer that will hold the certificate of conformity, the model year must be assigned prior to introduction of the vehicle into U.S. commerce. The certifying manufacturer must re-designate the model year if it does not complete its manufacturing operations within the originally identified model year. A vehicle introduced into U.S. commerce without a model year is deemed to have a model year equal to the calendar year of its introduction into U.S. commerce unless the certifying manufacturer assigns a later date.

Model year

as it applies to engines means the manufacturer's annual new model production period, except as restricted under this definition. It must include January 1 of the calendar year for which the model year is named, may not begin before January 2 of the previous calendar year, and it must end by December 31 of the named calendar year. Manufacturers may not adjust model years to circumvent or delay compliance with emission standards or to avoid the obligation to certify annually.

(1) The following provisions apply for production and ABT reports during the transition to engine-based model year determinations for tractors and vocational vehicles in 2020 and 2021:

(i) If a manufacturer installs model year 2020 or earlier engines in its vehicles in calendar year 2020, the manufacturers should include all those Phase 1 vehicles in its production and ABT reports related to model year 2020 compliance, although EPA may require the manufacturer to identify these separately from vehicles produced in calendar year 2019.

(ii) If a manufacturer installs model year 2020 engines in its vehicles in calendar year 2021, the manufacturer should submit production and ABT reports for those Phase 1 vehicles separate from the reports it submits for Phase 2 vehicles with model year 2021 engines.

Motor Vehicle

has the meaning given in 49 U.S.C. 32901.

Multi-purpose

has the meaning given in 40 CFR 1037.801.

Natural gas

has the meaning given in 40 CFR 1036.801. Vehicles that use a pilot-ignited natural gas engine (which uses a small diesel fuel ignition system), are still considered natural gas vehicles.

NHTSA Enforcement

means the NHTSA Associate Administrator for Enforcement, or his or her designee.

Neutral coasting

has the meaning given in 40 CFR 1037.801.

Neutral idle

has the meaning given in 40 CFR 1037.801.

New vehicles

has the meaning given to “new motor vehicle” provided in 40 CFR 1037.801.

Off-cycle technology

means technology certified under § 535.7 and by EPA under 40 CFR 86.1819-14(d)(13), 1036.610, and 1037.610 in the Phase 2 program.

Party

means the person alleged to have committed a violation of § 535.9, and includes manufacturers of vehicles and manufacturers of engines.

Payload

means in this part the resultant of subtracting the curb weight from the gross vehicle weight rating.

Percent

has the meaning given in 40 CFR 1036.801.

Petroleum

has the meaning given in 40 CFR 1037.801.

Phase 1

means the joint NHTSA and EPA program established in 2011 for fuel efficiency standards and greenhouse gas emissions standards regulating medium- and heavy-duty engines and vehicles. See § 535.5 for the specific model years that standards apply to vehicles and engines.

Phase 2

means the joint NHTSA and EPA program established in 2016 for fuel efficiency standards and greenhouse gas emissions standards regulating medium- and heavy-duty vehicles and engines. See § 535.5 for the specific model years that standards apply to vehicles and engines.

Pickup truck

has the meaning given in 49 CFR part 523.

Placed into service

has the meaning given in 40 CFR 1037.801.

Plug-in hybrid electric vehicle (PHEV)

means a hybrid electric vehicle that has the capability to charge the battery or batteries used for vehicle propulsion from an off-vehicle electric source, such that the off-vehicle source cannot be connected to the vehicle while the vehicle is in motion.

Power take-off (PTO)

means a secondary engine shaft or other system on a vehicle that provides substantial auxiliary power for purposes unrelated to vehicle propulsion or normal vehicle accessories such as air conditioning, power steering, and basic electrical accessories. A typical PTO uses a secondary shaft on the engine to transmit power to a hydraulic pump that powers auxiliary equipment such as a boom on a bucket truck.

Powertrain family

has the meaning given in 40 CFR 1037.231. Manufacturers choosing to perform powertrain testing as specified in 40 CFR 1037.550, divide product lines into powertrain families that are expected to have similar fuel consumptions and CO

emission characteristics throughout the useful life.

Preliminary approval

means approval granted by an authorized EPA representative prior to submission of an application for certification, consistent with the provisions of 40 CFR 1037.210. For requirements involving NHTSA, EPA will ensure decisions are jointly made and will convey the decision to the manufacturer.

Primary intended service class

has the same meaning for engines as specified in 40 CFR 1036.140. Manufacturers must identify a single primary intended service class for each engine family that best describes vehicles for which it designs and markets the engine, as follows:

(1) Divide compression-ignition engines into primary intended service classes based on the following engine and vehicle characteristics:

(i) Light heavy-duty “LHD” engines usually are not designed for rebuild and do not have cylinder liners. Vehicle body types in this group might include any heavy-duty vehicle built from a light-duty truck chassis, van trucks, multi-stop vans, and some straight trucks with a single rear axle. Typical applications would include personal transportation, light-load commercial delivery, passenger service, agriculture, and construction. The GVWR of these vehicles is normally below 19,500 pounds.

(ii) Medium heavy-duty “MHD” engines may be designed for rebuild and may have cylinder liners. Vehicle body types in this group would typically include school buses, straight trucks with single rear axles, city tractors, and a variety of special purpose vehicles such as small dump trucks, and refuse trucks. Typical applications would include commercial short haul and intra- city delivery and pickup. Engines in this group are normally used in vehicles whose GVWR ranges from 19,500 to 33,000 pounds.

(iii) Heavy heavy-duty “HHD” engines are designed for multiple rebuilds and have cylinder liners. Vehicles in this group are normally tractors, trucks, straight trucks with dual rear axles, and buses used in inter-city, long-haul applications. These vehicles normally exceed 33,000 pounds GVWR.

(2) Divide spark-ignition engines into primary intended service classes as follows:

(i) Spark-ignition engines that are best characterized by paragraph (1)(i) or (ii) of this section are in a separate “spark-ignition” primary intended service class.

(ii) Spark-ignition engines that are best characterized by paragraph (1)(iii) of this section share a primary intended service class with compression-ignition heavy heavy-duty engines. Gasoline-fueled engines are presumed not to be characterized by paragraph (1)(iii) of this section; for example, vehicle manufacturers may install some number of gasoline-fueled engines in Class 8 trucks without causing the engine manufacturer to consider those to be heavy heavy-duty engines.

(iii) References to “spark-ignition standards” in this part relate only to the spark-ignition engines identified in paragraph (b)(1) of this section. References to “compression-ignition standards” in this part relate to compression-ignition engines, to spark-ignition engines optionally certified to standards that apply to compression-ignition engines, and to all engines identified under paragraph (b)(2) of this section as heavy heavy-duty engines.

Rechargeable Energy Storage System (RESS)

means the component(s) of a hybrid engine or vehicle that store recovered energy for later use, such as the battery system in a electric hybrid vehicle.

Refuse hauler

has the meaning given in 40 CFR 1037.801.

Regional

has the meaning relating to the Regional duty cycle as specified in 40 CFR 1037.510.

Regulatory category

means each of the four types of heavy-duty vehicles defined in 49 CFR 523.6 and the heavy-duty engines used in these heavy-duty vehicles.

Regulatory subcategory

means the sub-groups in each regulatory category to which mandatory fuel consumption standards and requirements apply as specified in 40 CFR 1036.230 and 1037.230 and are defined as follows:

(1) Heavy-duty pick-up trucks and vans.

(2) Vocational vehicle subcategories have 18 separate vehicle service classes as shown in Tables 1 and 2 below and include vocational tractors. Table 1 includes vehicles complying with Phase 1 standards. Phase 2 vehicles are included in Table 2 which have separate subcategories to account for engine characteristics, GVWR, and the selection of duty cycle for vocational vehicles as specified in 40 CFR 1037.510; vehicles may additionally fall into one of the subcategories defined by the custom-chassis standards in § 535.5(b)(6) and 40 1037.105(h). Manufacturers using the alternate standards in § 535.5(b)(6) and 40 CFR 1037.105(h) should treat each vehicle type as a separate vehicle subcategory.

Table 1—Phase 1 Vocational Vehicle Subcategories

Vocational LHD vehicles.

Vocational MHD vehicles.

Vocational HHD vehicles.

Table 2—Phase 2 Vocational Vehicle Subcategories

Engine type

Vocational LHD

vehicles

Vocational MHD

vehicles

Vocational HHD

vehicles

Urban

Urban.

Multi-Purpose

Multi-Purpose.

Regional

Regional.

Urban

Multi-Purpose

Regional

(3) Tractor subcategories are shown in Table 3 below for Phase 1 and 2. Table 3 includes 10 separate subcategories for tractors complying with Phase 1 and 2 standards. The heavy-haul tractor subcategory only applies for Phase 2.

Table 3—Phase 1 and 2 Truck Tractor Subcategories

Class 7

Class 8 day cabs

Class 8 sleeper cabs

Low-roof tractors

Low-roof day cab tractors

Low-roof sleeper cab tractors.

Mid-roof tractors

Mid-roof day cab tractors

Mid-roof sleeper cab tractors.

High-roof tractors

High-roof day cab tractors

High-roof sleeper cab tractors.

Heavy-haul tractors (applies only to Phase 2 program).

(5) Engine subcategories are shown for each primary intended service class in Table 5 below. Table 5 includes 6 separate subcategories for engines which are the same for Phase 1 and 2 standards.

Table 5—Engine Subcategories

LHD engines

MHD engines

HHD engines

CI engines for vocational vehicles

CI engines for vocational vehicles.

CI engines for truck tractors

CI engines for truck tractors.

All spark-ignition engines.

Relating to

has the meaning given in 40 CFR 1037.801.

Revoke

has the same meaning given in 40 CFR 1068.30.

Roof height

means the maximum height of a vehicle (rounded to the nearest inch), excluding narrow accessories such as exhaust pipes and antennas, but including any wide accessories such as roof fairings. Measure roof height of the vehicle configured to have its maximum height that will occur during actual use, with properly inflated tires and no driver, passengers, or cargo onboard. Determine the base roof height on fully inflated tires having a static loaded radius equal to the arithmetic mean of the largest and smallest static loaded radius of tires a manufacturer offers or a standard tire EPA approves. If a vehicle is equipped with an adjustable roof fairing, measure the roof height with the fairing in its lowest setting. Once the maximum height is determined, roof heights are divided into the following categories:

(1) Low-roof means a vehicle with a roof height of 120 inches or less.

(2) Mid-roof means a vehicle with a roof height between 121 and 147 inches.

(3) High-roof means a vehicle with a roof height of 148 inches or more.

Round

has the meaning given in 40 CFR 1065.1001.

Secondary vehicle manufacturer

has the same meaning as final-stage manufacturer in 49 CFR part 567.

Service class group

means a group of engine and vehicle averaging sets defined as follows:

(1) Spark-ignition engines, light heavy-duty compression-ignition engines, light heavy-duty vocational vehicles and heavy-duty pickup trucks and vans.

(2) Medium heavy-duty compression-ignition engines and medium heavy-duty vocational vehicles and tractors.

(3) Heavy heavy-duty compression-ignition engines and heavy heavy-duty vocational vehicles and tractors.

Sleeper cab

means a type of truck cab that has a compartment behind the driver's seat intended to be used by the driver for sleeping. This includes both cabs accessible from the driver's compartment and those accessible from outside the vehicle.

Small business manufacturer

means a manufacturer meeting the criteria specified in 13 CFR 121.201. For manufacturers owned by a parent company, the employee and revenue limits apply to the total number employees and total revenue of the parent company and all its subsidiaries.

Spark-ignition (SI)

means relating to a gasoline-fueled engine or any other type of engine with a spark plug (or other sparking device) and with operating characteristics significantly similar to the theoretical Otto combustion cycle. Spark-ignition engines usually use a throttle to regulate intake air flow to control power during normal operation. Note that some spark-ignition engines are subject to requirements that apply for compression-ignition engines as described in 40 CFR 1036.140.

Standard payload

means the payload assumed for each vehicle, in tons, for modeling and calculating emission credits, as follows:

(1) For vocational vehicles:

(i) 2.85 tons for light heavy-duty vehicles.

(ii) 5.6 tons for medium heavy-duty vehicles.

(iii) 7.5 tons for heavy heavy-duty vocational vehicles.

(2) For tractors:

(i) 12.5 tons for Class 7.

(ii) 19 tons for Class 8.

(iii) 43 tons for heavy-haul tractors.

Standard tractor

has the meaning given in 40 CFR 1037.801.

Standard trailer

has the meaning given in 40 CFR 1037.801.

Stop start

has the meaning given in 40 CFR 1037.801

Subconfiguration

means a unique combination within a vehicle configuration of equivalent test weight, road-load horsepower, and any other operational characteristics or parameters that EPA determines may significantly affect CO2 emissions within a vehicle configuration as defined in 40 CFR 600.002.

Suspend

has the meaning given in 40 CFR 1037.801.

Tank trailer

has the meaning given in 40 CFR 1037.801.

Test group

means the multiple vehicle lines and model types that share critical emissions and fuel consumption related features and that are certified as a group by a common certificate of conformity issued by EPA and is used collectively with other test groups within an averaging set or regulatory subcategory and is used by NHTSA for determining the fleet average fuel consumption.

The agencies

means the National Highway Traffic Safety Administration (NHTSA) and the Environmental Protection Agency (EPA) in this part.

Tire pressure monitoring system (TPMS)

has the meaning given in section S3 of 49 CFR 571.138.

Tire rolling resistance level (TRRL)

means a value with units of kg/metric ton that represents that rolling resistance of a tire configuration. TRRLs are used as inputs to the GEM model under 40 CFR 1037.520. Note that a manufacturer may assign a value higher than a measured rolling resistance of a tire configuration.

Towing capacity

in this part is equal to the resultant of subtracting the gross vehicle weight rating from the gross combined weight rating.

Trade

means to exchange fuel consumption credits, either as a buyer or a seller.

U.S.-directed production volume

means the number of vehicle units, subject to the requirements of this part, produced by a manufacturer for which the manufacturer has a reasonable assurance that sale was or will be made to ultimate purchasers in the United States.

Useful life

has the meaning given in 40 CFR 1036.801 and 1037.801.

Vehicle configuration

means a unique combination of vehicle hardware and calibration (related to measured or modeled emissions) within a vehicle family as specified in 40 CFR 1037.801.

Vehicles with hardware or software differences, but that have no hardware or software differences related to measured or modeled emissions or fuel consumption can be included in the same vehicle configuration. Note that vehicles with hardware or software differences related to measured or modeled emissions or fuel consumption are considered to be different configurations even if they have the same GEM inputs and FEL. Vehicles within a vehicle configuration differ only with respect to normal production variability or factors unrelated to measured or modeled emissions and fuel consumption for EPA and NHTSA.

Vehicle family

has the meaning given in 40 CFR 1037.230. Manufacturers designate families in accordance with EPA provisions and may not choose different families between the NHTSA and EPA programs. If a manufacturer is certifying vehicles within a vehicle family to more than one FEL, it must subdivide its greenhouse gas and fuel consumption vehicle families into subfamilies that include vehicles with identical FELs. Note that a manufacturer may add subfamilies at any time during the model year.

Vehicle service class

has the same meaning for vehicles as specified in 40 CFR 1037.140.

Vehicle subfamily or subfamily

means a subset of a vehicle family including vehicles subject to the same FEL(s).

Vocational tractor

has the meaning given in 40 CFR 1037.801.

Void

has the meaning given in 40 CFR 1036.30.

Zero emissions vehicle

means an electric vehicle or a fuel cell vehicle.

§ 535.5

Standards.

(a)

Heavy-duty pickup trucks and vans.

Each manufacturer's fleet of heavy-duty pickup trucks and vans shall comply with the fuel consumption standards in this paragraph (a) expressed in gallons per 100 miles. Each vehicle must be manufactured to comply for its full useful life. For the Phase 1 program, if the manufacturer's fleet includes conventional vehicles (gasoline, diesel and alternative fueled vehicles) and advanced technology vehicles (hybrids with powertrain designs that include energy storage systems, vehicles with waste heat recovery, electric vehicles and fuel cell vehicles), it may divide its fleet into two separate fleets each with its own separate fleet average fuel consumption standard which the manufacturer must comply with the requirements of this paragraph (a). For Phase 2, manufacturers may calculate their fleet average fuel consumption standard for a conventional fleet and multiple advanced technology vehicle fleets. Advanced technology vehicle fleets should be separated into plug-in hybrid electric vehicles, electric vehicles and fuel cell vehicles. The standards in this paragraph (a) correspond to the same requirements for EPA as specified in 40 CFR 86.1819-14. Manufacturers must apply the fuel consumption standards in this paragraph (a) to the same vehicles and engines using the same options used to comply with EPA in 40 CFR part 86, subpart S. Engines that comply to the standards in this paragraph are not allowed to comply with the standards in paragraph (d) of this section.

(1)

Mandatory standards.

For model years 2016 and later, each manufacturer must comply with the fleet average standard derived from the unique subconfiguration target standards (or groups of subconfigurations approved by EPA in accordance with 40 CFR 86.1819) of the model types that make up the manufacturer's fleet in a given model year. Each subconfiguration has a unique attribute-based target standard, defined by each group of vehicles having the same payload, towing capacity and whether the vehicles are equipped with a 2-wheel or 4-wheel drive configuration. Phase 1 target standards apply for model years 2016 through 2020. Phase 2 target standards apply for model year 2021 and afterwards.

(2)

Subconfiguration target standards.

(i) Two alternatives exist for determining the subconfiguration target standards for Phase 1. For each alternative, separate standards exist for compression-ignition and spark-ignition vehicles:

(A) The first alternative allows manufacturers to determine a fixed fuel consumption standard that is constant over the model years; and

(B) The second alternative allows manufacturers to determine standards that are phased-in gradually each year.

(ii) Calculate the subconfiguration target standards as specified in this paragraph (a)(2)(ii) of this section, using the appropriate coefficients from Table 6 choosing between the alternatives in paragraph (a)(2)(i) of this section. For electric or fuel cell heavy-duty vehicles, use compression-ignition vehicle coefficients “c” and “d” and for hybrid (including plug-in hybrid), dedicated and dual-fueled vehicles, use coefficients “c” and “d” appropriate for the engine type used. Round each standard to the nearest 0.001 gallons per 100 miles and specify all weights in pounds rounded to the nearest pound. Calculate the subconfiguration target standards using the following equation:

Subconfiguration Target Standard (gallons per 100 miles) = [c × (WF)] + d

Where:

WF = Work Factor = [0.75 × (Payload Capacity + Xwd)] + [0.25 × Towing Capacity]

Xwd = 4wd Adjustment = 500 lbs if the vehicle group is equipped with 4wd and all-wheel drive, otherwise equals 0 lbs for 2wd.

Payload Capacity = GVWR (lbs)−Curb Weight (lbs) (for each vehicle group) Towing

Capacity = GCWR (lbs)−GVWR (lbs) (for each vehicle group)

Table 6—Coefficients for Mandatory Subconfiguration Target Standards

Model year(s)

Phase 1 Alternative 1—Fixed Target Standards

CI Vehicle Coefficients

2016 to 2018

0.0004322

3.330

2019 to 2020

0.0004086

3.143

SI Vehicle Coefficients

2016 to 2017

0.0005131

3.961

2018 to 2020

0.0004086

3.143

Phase 1 Alternative 2—Phased-in Target Standards

CI Vehicle Coefficients

2016

0.0004519

3.477

2017

0.0004371

3.369

2018 to 2020

0.0004086

3.143

SI Vehicle Coefficients

2016

0.0005277

4.073

2017

0.0005176

3.983

2018 to 2020

0.0004951

3.815

Phase 2—Fixed Target Standards

CI Vehicle Coefficients

2021

0.0003988

3.065

2022

0.0003880

2.986

2023

0.0003792

2.917

2024

0.0003694

2.839

2025

0.0003605

2.770

2026

0.0003507

2.701

2027 and later

0.0003418

2.633

SI Vehicle Coefficients

2021

0.0004827

3.725

2022

0.0004703

3.623

2023

0.0004591

3.533

2024

0.0004478

3.443

2025

0.0004366

3.364

2026

0.0004253

3.274

2027 and later

0.0004152

3.196

(3)

Fleet average fuel consumption standard.

(i) For the Phase 1 program, calculate each manufacturer's fleet average fuel consumption standard for a conventional fleet and a combined advanced technology fleet separately based on the subconfiguration target standards specified in paragraph (a)(2) of this section, weighted to production volumes and averaged using the following equation combining all the applicable vehicles in a manufacturer's U.S.-directed fleet (compression-ignition, spark-ignition and advanced technology vehicles) for a given model year, rounded to the nearest 0.001 gallons per 100 miles:

EP13SE22.000

Where:

Subconfiguration Target Standard

= fuel consumption standard for each group of vehicles with same payload, towing capacity and drive configuration (gallons per 100 miles).

Volume

= production volume of each unique subconfiguration of a model type based upon payload, towing capacity and drive configuration.

(A) A manufacturer may group together subconfigurations that have the same test weight (ETW), GVWR, and GCWR. Calculate work factor and target value assuming a curb weight equal to two times ETW minus GVWR.

(B) A manufacturer may group together other subconfigurations if it uses the lowest target value calculated for any of the subconfigurations.

(ii) For Phase 1, manufacturers must select an alternative for subconfiguration target standards at the same time they submit the model year 2016 pre-model year Report, specified in § 535.8. Once selected, the decision cannot be reversed and the manufacturer must continue to comply with the same alternative for subsequent model years.

(4)

Voluntary standards.

(i) Manufacturers may choose voluntarily to comply early with fuel consumption standards for model years 2013 through 2015, as determined in paragraphs (a)(4)(iii) and (iv) of this section, for example, in order to begin accumulating credits through over-compliance with the applicable standard. A manufacturer choosing early compliance must comply with all the vehicles and engines it manufactures in each regulatory category for a given model year.

(ii) A manufacturer must declare its intent to voluntarily comply with fuel consumption standards at the same time it submits a Pre-Model Report, prior to the compliance model year beginning as specified in § 535.8; and, once selected, the decision cannot be reversed and the manufacturer must continue to comply for each subsequent model year for all the vehicles and engines it manufactures in each regulatory category for a given model year.

(iii) Calculate separate subconfiguration target standards for compression-ignition and spark- ignition vehicles for model years 2013 through 2015 using the equation in paragraph (a)(2)(ii) of this section, substituting the appropriate values for the coefficients in the following table as appropriate:

Table 7—Coefficients for Voluntary Subconfiguration Target Standards

Model year(s)

CI Vehicle Coefficients

2013 and 14

0.0004695

3.615

2015

0.0004656

3.595

SI Vehicle Coefficients

2013 and 14

0.0005424

4.175

2015

0.0005390

4.152

(iv) Calculate the fleet average fuel consumption standards for model years 2013 through 2015 using the equation in paragraph (a)(3) of this section.

(5)

Exclusion of vehicles not certified as complete vehicles.

The vehicle standards in paragraph (a) of this section do not apply for vehicles that are chassis-certified with respect to EPA's criteria pollutant test procedure in 40 CFR part 86, subpart S. Any chassis-certified vehicles must comply with the vehicle standards and requirements of paragraph (b) of this section and the engine standards of paragraph (d) of this section for engines used in these vehicles. A vehicle manufacturer choosing to comply with this paragraph and that is not the engine manufacturer is required to notify the engine manufacturers that their engines are subject to paragraph (d) of this section and that it intends to use their engines in excluded vehicles.

(6)

Optional certification under this section.

Manufacturers may certify certain complete or cab- complete vehicles to the fuel consumption standards of this section. All vehicles optionally certified under this paragraph (a)(6) are deemed to be subject to the fuel consumption standards of this section given the following conditions:

(i) For fuel consumption compliance, manufacturers may certify any complete or cab-complete spark-ignition vehicles above 14,000 pounds GVWR and at or below 26,000 pounds GVWR to the fuel consumption standards of this section.

(ii) Manufacturers may apply the provisions of this section to cab-complete vehicles based on a complete sister vehicle. In unusual circumstances, manufacturers may ask the agencies to apply these provisions to Class 2b or Class 3 incomplete vehicles that do not meet the definition of cab-complete.

(A) Except as specified in paragraph (a)(6)(iii) of this section, for purposes of this section, a complete sister vehicle is a complete vehicle of the same vehicle configuration as the cab- complete vehicle. A manufacturer may not apply the provisions of this paragraph (a)(6) to any vehicle configuration that has a four-wheel rear axle if the complete sister vehicle has a two- wheel rear axle.

(B) Calculate the target value for the fleet-average fuel consumption standard under paragraph (a)(3) of this section based on the work factor value that applies for the complete sister vehicle.

(C) Test these cab-complete vehicles using the same equivalent test weight and other dynamometer settings that apply for the complete vehicle from which you used the work factor value (the complete sister vehicle). For fuel consumption certification, manufacturers may submit the test data from that complete sister vehicle instead of performing the test on the cab- complete vehicle.

(D) Manufacturers are not required to produce the complete sister vehicle for sale to use the provisions of this paragraph (a)(6)(ii). This means the complete sister vehicle may be a carryover vehicle from a prior model year or a vehicle created solely for the purpose of testing.

(iii) For fuel consumption purposes, if a cab-complete vehicle is not of the same vehicle configuration as a complete sister vehicle due only to certain factors unrelated to coastdown performance, manufacturers may use the road-load coefficients from the complete sister vehicle for certification testing of the cab-complete vehicle, but it may not use fuel consumption data from the complete sister vehicle for certifying the cab-complete vehicle.

(7)

Loose engines.

For model year 2023 and earlier spark-ignition engines with identical hardware compared with engines used in vehicles certified to the standards of this section, where such engines are sold as loose engines or as engines installed in incomplete vehicles that are not cab-complete vehicles. Manufacturers may certify such engines to the standards of this section, subject to the following provisions:

(i) For 2020 and earlier model years, the maximum allowable U.S.-directed production volume of engines manufacturers may sell under this paragraph (a)(7) in any given model year is ten percent of the total U.S-directed production volume of engines of that design that the manufacturer produces for heavy-duty applications for that model year, including engines it produces for complete vehicles, cab-complete vehicles, and other incomplete vehicles. The total number of engines a manufacturer may certify under this paragraph (a)(7), of all engine designs, may not exceed 15,000 in any model year. Engines produced in excess of either of these limits are not covered by your certificate. For example, a manufacturer produces 80,000 complete model year 2017 Class 2b pickup trucks with a certain engine and 10,000 incomplete model year 2017 Class 3 vehicles with that same engine, and the manufacturer did not apply the provisions of this paragraph (a)(7) to any other engine designs, it may produce up to 10,000 engines of that design for sale as loose engines under this paragraph (a)(7). If a manufacturer produced 11,000 engines of that design for sale as loose engines, the last 1,000 of them that it produced in that model year 2017 would be considered uncertified.

(ii) For model years 2021 through 2023, the U.S.-directed production volume of engines manufacturers sell under this paragraph (a)(7) in any given model year may not exceed 10,000 units. This paragraph (a)(7) does not apply for engines certified to the standards of paragraph (d) of this section and 40 CFR 1036.108.

(iii) Vehicles using engines certified under this paragraph (a)(7) are subject to the fuel consumption and emission standards of paragraph (b) of this section and 40 CFR 1037.105 and engine standards in 40 CFR 1036.150(j).

(iv) For certification purposes, engines are deemed to have a fuel consumption target values and test result equal to the fuel consumption target value and test result for the complete vehicle in the applicable test group with the highest equivalent test weight, except as specified in paragraph (a)(7)(iv)(B) of this part. Manufacturers use these values to calculate target values and the fleet- average fuel consumption rate. Where there are multiple complete vehicles with the same highest equivalent test weight, select the fuel consumption target value and test result as follows:

(A) If one or more of the fuel consumption test results exceed the applicable target value, use the fuel consumption target value and test result of the vehicle that exceeds its target value by the greatest amount.

(B) If none of the fuel consumption test results exceed the applicable target value, select the highest target value and set the test result equal to it. This means that the manufacturer may not generate fuel consumption credits from vehicles certified under this paragraph (a)(7).

(8)

Alternative fuel vehicle conversions.

Alternative fuel vehicle conversions may demonstrate compliance with the standards of this part or other alternative compliance approaches allowed by EPA in 40 CFR 85.525.

(9)

Advanced, innovative and off-cycle technologies.

For vehicles subject to Phase 1 standards, manufacturers may generate separate credit allowances for advanced and innovative technologies as specified in § 535.7(f)(1) and (2). For vehicles subject to Phase 2 standards, manufacturers may generate separate credits allowance for off-cycle technologies in accordance with § 535.7(f)(2). Separate credit allowances for advanced technology vehicles cannot be generated; instead manufacturers may use the credit multipliers specified in § 535.7(f)(1)(iv) through model year 2026.

(10)

Useful life.

The following useful life values apply for the standards of this section:

(i) 120,000 miles or 10 years, whichever comes first, for Class 2b through Class 3 heavy-duty pickup trucks and vans certified to Phase 1 standards.

(ii) 150,000 miles or 15 years, whichever comes first, for Class 2b through Class 3 heavy-duty pickup trucks and vans certified to Phase 2 standards.

(iii) For Phase 1 credits that you calculate based on a useful life of 120,000 miles, multiply any banked credits that you carry forward for use into the Phase 2 program by 1.25. For Phase 1 credit deficits that you generate based on a useful life of 120,000 miles multiply the credit deficit by 1.25 if offsetting the shortfall with Phase 2 credits.

(11)

Compliance with standards.

A manufacturer complies with the standards of this part as described in § 535.10.

(b)

Heavy-duty vocational vehicles.

Each manufacturer building complete or incomplete heavy- duty vocational vehicles shall comply with the fuel consumption standards in this paragraph (b) expressed in gallons per 1000 ton-miles. Manufacturers must apply the fuel consumption standards in this paragraph (b) to the same vehicles using the same options used to comply with EPA in 40 CFR 1037.105. Engines used in heavy-duty vocational vehicles shall comply with the standards in paragraph (d) of this section. Each vehicle must be manufactured to comply for its full useful life. Standards apply to the vehicle subfamilies based upon the vehicle service classes within each of the vocational vehicle regulatory subcategories in accordance with § 535.4 and based upon the applicable modeling and testing specified in § 535.6. Determine the duty cycles that apply to vocational vehicles according to 40 CFR 1037.140 and 1037.150(z).

(1)

Mandatory standards.

Heavy-duty vocational vehicle subfamilies produced for Phase 1 must comply with the fuel consumption standards in paragraph (b)(3) of this section. For Phase 2, each vehicle manufacturer of heavy-duty vocational vehicle subfamilies must comply with the fuel consumption standards in paragraph (b)(4) of this section.

(i) For model years 2016 to 2020, the heavy-duty vocational vehicle category is subdivided by GVWR into three regulatory subcategories as defined in § 535.4, each with its own assigned standard.

(ii) For model years 2021 and later, the heavy-duty vocational vehicle category is subdivided into 15 regulatory subcategories depending upon whether vehicles are equipped with a compression or spark-ignition engine, as defined in § 535.4. Standards also differ based upon vehicle service class and intended vehicle duty cycles. See 40 CFR 1037.140 and 1037.150(z).

(iii) For purposes of certifying vehicles to fuel consumption standards, manufacturers must divide their product lines in each regulatory subcategory into vehicle families that have similar emissions and fuel consumption features, as specified by EPA in 40 CFR 1037.230. These families will be subject to the applicable standards. Each vehicle family is limited to a single model year.

(2)

Voluntary compliance.

(i) For model years 2013 through 2015, a manufacturer may choose voluntarily to comply early with the fuel consumption standards provided in paragraph (b)(3)

of this section. For example, a manufacturer may choose to comply early in order to begin accumulating credits through over-compliance with the applicable standards. A manufacturer choosing early compliance must comply with all the vehicles and engines it manufactures in each regulatory category for a given model year.

(ii) A manufacturer must declare its intent to voluntarily comply with fuel consumption standards and identify its plans to comply before it submits its first application for a certificate of conformity for the respective model year as specified in § 535.8; and, once selected, the decision cannot be reversed and the manufacturer must continue to comply for each subsequent model year for all the vehicles and engines it manufactures in each regulatory category for a given model year.

(3)

Regulatory subcategory standards for model years 2013 to 2020.

The mandatory and voluntary fuel consumption standards for heavy-duty vocational vehicles are given in the following table:

Table 8—Phase 1 Vocational Vehicle Fuel Consumption Standards

[Gallons per 1000 ton-miles]

Regulatory subcategories

Vocational LHD Vehicles

Vocational MHD

Vehicles

Vocational HHD

Vehicles

Model Years 2013 to 2016 Voluntary Standards

Standard

38.1139

22.9862

22.2004

Model Years 2017 to 2020 Mandatory Standards

Standard

36.6405

22.1022

21.8075

(4)

Regulatory subcategory standards for model years 2021 and later.

The mandatory fuel consumption standards for heavy-duty vocational vehicles are given in the following table:

BILLING CODE 4910-59-P

EP13SE22.002

EP13SE22.003

BILLING CODE 4910-59-C

(5)

Subfamily standards.

Manufacturers may specify a family emission limit (FEL) in terms of fuel consumption for each vehicle subfamily. The FEL may not be less than the result of fuel consumption modeling from 40 CFR 1037.520. The FELs is the fuel consumption standards for the vehicle subfamily instead of the standards specified in paragraph (b)(3) and (4) of this section and can be used for calculating fuel consumption credits in accordance with § 535.7.

(6)

Alternate standards for custom chassis vehicles for model years 2021 and later.

Manufacturers may elect to certify certain vocational vehicles to the alternate standards for custom chassis vehicles specified in this paragraph (b)(6) instead of the standards specified in paragraph (b)(4) of this section. Note that, although these standards were established for custom chassis vehicles, manufacturers may apply these provisions to any qualifying vehicle even though these standards were established for custom chassis vehicles. For example, large diversified vehicle manufacturers may certify vehicles to the refuse hauler standards of this section as long as the manufacturer ensures that those vehicles qualify as refuse haulers when placed into service. GEM simulates vehicle operation for each type of vehicle based on an assigned vehicle service class, independent of the vehicle's actual characteristics, as shown in Table 10 of this section; however, standards apply for the vehicle's useful life based on its actual characteristics as specified in paragraph (b)(10) of this section. Vehicles certified to these alternative standards must use engines certified to requirements under paragraph (d) of this section and 40 CFR part 1036 for the appropriate model year, except that motor homes and emergency vehicles may use engines certified with the loose-engine provisions of paragraph

(a)(7) of this section and 40 CFR 1037.150(m). This also applies for vehicles meeting standards under paragraphs (a)(6)(iv) through (vi) of this section. The fuel consumption standards for custom chassis vehicles are given in the following table:

Table 10—Phase 2 Custom Chassis Fuel Consumption Standards

[Gallon per 1,000 ton-mile]

Vehicle type

Assigned vehicle service class

MY 2021

MY 2027

School Bus

MHD Vehicle

28.5855

26.6208

Motor Home

MHD Vehicle

22.3969

22.2004

Coach Bus

HHD Vehicle

20.6287

20.1375

Other bus

HHD Vehicle

29.4695

28.0943

Refuse hauler

HHD Vehicle

30.7466

29.2731

Concrete mixer

HHD Vehicle

31.3360

31.0413

Mixed-use vehicle

HHD Vehicle

31.3360

31.0413

Emergency Vehicle

HHD Vehicle

31.8271

31.3360

Vehicle types are generally defined in § 535.3. “Other bus” includes any bus that is not a school bus or a coach bus. A “mixed-use vehicle” is one that meets at least one of the criteria specified in 40 CFR 1037.631(a)(1) or at least one of the criteria in 40 CFR 1037.631(a)(2), but not both.

(i) Manufacturers may generate or use fuel consumption credits for averaging to demonstrate compliance with the alternative standards as described in § 535.7(c). This requires that manufacturers specify a Family Emission Limit (FEL) for fuel consumption for each vehicle subfamily. The FEL may not be less than the result of emission modeling as described in this paragraph (b). These FELs serve as the fuel consumption standards for the vehicle subfamily instead of the standards specified in this paragraph (b)(6). Manufacturers may only use fuel consumption credits for vehicles certified to the optional standards in this paragraph (b)(6) as specified in § 535.7(c)(6) through (8) and you may not bank or trade fuel consumption credits from any vehicles certified under this paragraph (b)(6).

(ii) For purposes of this paragraph (b)(6), each separate vehicle type identified in Table 10 of this section is in a separate averaging set.

(iii) For purposes of emission and fuel consumption modeling under 40 CFR 1037.520, consider motor homes and coach buses to be subject to the Regional duty cycle, and consider all other vehicles to be subject to the Urban duty cycle.

(iv) Emergency vehicles are deemed to comply with the standards of this paragraph (b)(6) if manufacturers use tires with TRRL at or below 8.4 kg/ton (8.7 g/ton for model years 2021 through 2026).

(v) Concrete mixers are deemed to comply with the standards of this paragraph (b)(6) if manufacturers use tires with TRRL at or below 7.1 kg/ton (7.6 g/ton for model years 2021 through 2026).

(vi) Motor homes are deemed to comply with the standards of this paragraph (b)(6) if manufacturers use the following technologies:

(A) Tires with TRRL at or below 6.0 kg/ton (6.7 g/ton for model years 2021 through 2026).

(B) Automatic tire inflation systems or tire pressure monitoring systems with wheels on all axles.

(C) Tire pressure monitoring systems must use low pressure warning and malfunction telltales in clear view of the driver as specified in S4.3 and S4.4 of 49 CFR 571.138.

(vii) Small business manufacturers using the alternative standards for custom chassis vehicles under this paragraph (b)(6) may use fuel consumption credits subject to the unique provisions in § 535.7(a)(9).

(7)

Advanced, innovative and off-cycle technologies.

For vocational vehicles subfamilies subject to Phase 1 standards, manufacturers must create separate vehicle subfamilies for vehicles that contain advanced or innovative technologies and group those vehicles together in a vehicle subfamily if they use the same advanced or innovative technologies. Manufacturers may generate separate credit allowances for advanced and innovative technologies as specified in § 535.7(f)(1) and (2). For vehicle subfamilies subject to Phase 2 standards, manufacturers may generate separate credit allowances for off-cycle technologies in accordance with § 535.7(f)(2). Separate credit allowances for advanced technology vehicles cannot be generated but instead manufacturers may use the credit multipliers specified in § 535.7(f)(1)(iv) through model year 2026.

(8)

Certifying across service classes.

A manufacturer may optionally certify vocational vehicle subfamilies to the standards and useful life applicable to a heavier vehicle service class (such as MHD vocational vehicles instead of LHD vocational vehicles). Provisions related to generating fuel consumption credits apply as follows:

(i) If a manufacturer certifies all its vehicles from a given vehicle service class in a given model year to the standards and useful life that applies for a heavier vehicle service class, it may generate credits as appropriate for the heavier service class.

(ii) Class 8 hybrid vehicles with light or medium heavy-duty engines may be certified to compression-ignition standards for the Heavy HDV service class. A manufacturer may generate and use credits as allowed for the Heavy HDV service class.

(iii) Except as specified in paragraphs (b)(8)(i) and (ii) of this section, a manufacturer may not generate credits with the vehicle. If you include lighter vehicles in a subfamily of heavier vehicles with an FEL below the standard, exclude the production volume of lighter vehicles from the credit calculation. Conversely, if a manufacturer includes lighter vehicles in a subfamily with an FEL above the standard, it must include the production volume of lighter vehicles in the credit calculation.

(9)

Off-road exemptions.

This section provides an exemption for heavy-duty vocational vehicle subfamilies, including vocational tractors that are intended to be used extensively in off-road environments such as forests, oil fields, and construction sites from the fuel consumption standards in this paragraph (b). Vehicle exempted by this part do not comply with vehicle standards in this paragraph (b), but the engines in these vehicles must meet the engine requirements of paragraph (d) of this section. Note that manufacturers may not include these exempted vehicles in any credit calculations under this part.

(i) Qualifying criteria.

Vocational vehicles intended for off-road use are exempt without request, subject to the provisions of this section, if they are primarily designed to perform work off-road (such as in oil fields, mining, forests, or construction sites), and they meet at least one of the criteria of paragraph (b)(9)(i)(A) of this section and at least one of the criteria of paragraph (b)(9)(i)(B) of this section. See paragraph (b)(6) of this section for alternate standards that apply for vehicles meeting only one of these sets of criteria.

(A) The vehicle must have affixed components designed to work inherently in an off-road environment (such as hazardous material equipment or off-road drill equipment) or be designed to operate at low speeds such that it is unsuitable for normal highway operation.

(B) The vehicle must meet one of the following criteria:

(1) Have an axle that has a gross axle weight rating (GAWR) at or above 29,000 pounds.

(2) Have a speed attainable in 2.0 miles of not more than 33 mi/hr.

(3) Have a speed attainable in 2.0 miles of not more than 45 mi/hr, an unloaded vehicle weight that is not less than 95 percent of its gross vehicle weight rating, and no capacity to carry occupants other than the driver and operating crew.

(4) Have a maximum speed at or below 54 mi/hr. A manufacturer may consider the vehicle to be appropriately speed-limited if engine speed at 54 mi/hr is at or above 95 percent of the engine's maximum test speed in the highest available gear. A manufacturer may alternatively limit vehicle speed by programming the engine or vehicle's electronic control module in a way that is tamper-resistant.

(ii) Tractors.

The provisions of this section may apply for tractors only if each tractor qualifies as a vocational tractor under paragraph (c)(9) of this section or is granted approval for the exemption as specified in paragraph (b)(9)(iii) of this section.

(iii) Preliminary Approval before Certification.

If a manufacturer has unusual circumstances where it may be questionable whether its vehicles qualify for the off-road exemption of this part, the manufacturer may send the agencies information before finishing its application for certification (see 40 CFR 1037.205) for the applicable vehicles and ask for a preliminary informal approval. The agencies will review the request and make an appropriate determination in accordance with 40 CFR 1037.210. The agencies will generally not reverse a decision where they have given a manufacturer preliminary approval, unless the agencies find new information supporting a different decision. However, the agencies will normally not grant relief in cases where the vehicle manufacturer has credits or can otherwise comply with the applicable standards.

(iv) Recordkeeping and reporting.

(A) A manufacturer must keep records to document that its exempted vehicle configurations meet all applicable requirements of this section. Keep these records for at least eight years after you stop producing the exempted vehicle model. The agencies may review these records at any time.

(B) A manufacturer must also keep records of the individual exempted vehicles you produce, including the vehicle identification number and a description of the vehicle configuration.

(C) Within 90 days after the end of each model year, manufacturers must send to EPA a report as specified in § 535.8(g)(7) and EPA will make the report available to NHTSA.

(v) Compliance.

(A) Manufacturers producing vehicles meeting the off-road exemption criteria in paragraph (b)(9)(i) of this section or that are granted a preliminary approval comply with the standards of this part.

(B) In situations where a manufacturer would normally ask for a preliminary approval subject to paragraph (b)(9)(iii) of this section but introduces its vehicle into U.S. commerce without seeking approval first from the agencies, those vehicles violate compliance with the fuel consumption standards of this part and the EPA provisions under 40 CFR 1068.101(a)(1).

(C) If at any time, the agencies find new information that contradicts a manufacturer's use of the off-road exemption of this part, the manufacturers vehicles will be determined to be non-compliant with the regulations of this part and the manufacturer may be liable for civil penalties.

(10)

Useful life.

The following useful life values apply for the standards of this section:

(i) 110,000 miles or 10 years, whichever comes first, for vocational LHD vehicles certified to Phase 1 standards.

(ii) 150,000 miles or 15 years, whichever comes first, for vocational LHD vehicles certified to Phase 2 standards.

(iii) 185,000 miles or 10 years, whichever comes first, for vocational MHD vehicles for Phase 1 and 2.

(iv) 435,000 miles or 10 years, whichever comes first, for vocational HHD vehicles for Phase 1 and 2.

(v) For Phase 1 credits calculated based on a useful life of 110,000 miles, multiply any banked credits carried forward for use into the Phase 2 program by 1.36. For Phase 1 credit deficits generated based on a useful life of 110,000 miles multiply the credit deficit by 1.36, if offsetting the shortfall with Phase 2 credits.

(11)

Recreational vehicles.

Recreational vehicles manufactured after model year 2020 must comply with the fuel consumption standards of this section. Manufacturers producing these vehicles may also certify to fuel consumption standards from 2014 through model year 2020. Manufacturers may earn credits retroactively for early compliance with fuel consumption standards. Once selected, a manufacturer cannot reverse the decision and the manufacturer must continue to comply for each subsequent model year for all the vehicles it manufacturers in each regulatory subcategory for a given model year.

(12)

Loose engines.

Manufacturers may certify certain spark-ignition engines along with chassis-certified heavy-duty vehicles where there are identical engines used in those vehicles as described in 40 CFR 86.1819(k)(8) and 40 CFR 1037.150(m). Vehicles in which those engines are installed are subject to standards under this part.

(13)

Compliance with standards.

A manufacturer complies with the standards of this part as described in § 535.10.

(c)

Truck tractors.

Each manufacturer building truck tractors, except vocational tractors or vehicle constructed in accordance with § 571.7(e), with a GVWR above 26,000 pounds shall comply with the fuel consumption standards in this paragraph (c) expressed in gallons per 1000 ton-miles. Manufacturers must apply the fuel consumption standards in this paragraph (c) to the same vehicles using the same options used to comply with EPA in 40 CFR 1037.106. Engines used in heavy-duty truck tractors vehicles shall comply with the standards in paragraph (d) of this section. Each vehicle must be manufactured to comply for its full useful life. Standards apply to the vehicle subfamilies within each of the tractor vehicle regulatory subcategories in accordance with § 535.4 and 40 CFR 1037.230 and based upon the applicable modeling and testing specified in § 535.6. Determine the vehicles in each regulatory subcategory in accordance with 40 CFR 1037.140.

(1)

Mandatory standards.

For model years 2016 and later, each manufacturer's truck tractor subfamilies must comply with the fuel consumption standards in paragraph (c)(3) of this section.

(i) Based on the roof height and the design of the cab, the truck tractor category is divided into subcategories as described in § 535.4. The standards that apply to each regulatory subcategory are shown in paragraphs (c)(2) and (3) of this section, each with its own assigned standard.

(A) When calculating a vehicle's roof height and trailer's length should be determined from nominal design specifications, as provided in 40 CFR 1037.140.

(B) Specify design values for roof height and trailer length to the nearest inch.

(ii) For purposes of certifying vehicles to fuel consumption standards, manufacturers must divide their product lines in each regulatory subcategory into vehicles subfamilies that have similar emissions and fuel consumption features, as specified by EPA in 40 CFR 1037.230, and these subfamilies will be subject to the applicable standards. Each vehicle subfamily is limited to a single model year.

(iii) Standards for truck tractor engines are given in paragraph (d) of this section.

(2)

Voluntary compliance.

(i) For model years 2013 through 2015, a manufacturer may choose voluntarily to comply early with the fuel consumption standards provided in paragraph (c)(3) of this section. For example, a manufacturer may choose to comply early in order to begin accumulating credits through over-compliance with the applicable standards. A manufacturer choosing early compliance must comply with all the vehicles and engines it manufacturers in each regulatory category for a given model year.

(ii) A manufacturer must declare its intent to voluntarily comply with fuel consumption standards and identify its plans to comply before it submits its first application for a certificate of conformity for the respective model year as specified in § 535.8; and, once selected, the decision cannot be reversed and the manufacturer must continue to comply for each subsequent model year for all the vehicles and engines it manufacturers in each regulatory category for a given model year.

(3)

Regulatory subcategory standards.

The fuel consumption standards for truck tractors, except for vocational tractors, are given in the following table:

BILLING CODE 4910-59-P

EP13SE22.004

BILLING CODE 4910-59-C

(4)

Subfamily standards.

Manufacturers may generate or use fuel consumption credits for averaging, banking, and trading as described in § 535.7(c). This requires that manufacturers calculate a credit quantity if they specify a family emission limit (FEL) that is different than the standard specified in this section. The FEL may not be less than the result of emission and fuel consumption modeling from 40 CFR 1037.520. These FELs serve as the emission standards for the specific vehicle subfamily instead of the standards specified in paragraph (c)(2) of this section.

(5)

Alternate standards for tractors at or above 120,000 pounds GCWR.

Manufacturers may certify tractors at or above 120,000 pounds GCWR to the following fuel consumption standards in the following table:

Table 12—Alternate Fuel Consumption Standards for Tractors Above 120,000 Pounds GCWR for 2021 MY and Later

[Gallons per 1,000 ton-miles]

Regulatory subcategory

Model years

2021-2023

Model years

2024-2026

Model years

2026 and later

Heavy Class 8 Low-Roof Day Cab

5.25540

4.99018

4.80354

Heavy Class 8 Low-Roof Sleeper Cab

4.62672

4.37132

4.16503

Heavy Class 8 Mid-Roof Day Cab

5.46169

5.18664

4.99018

Heavy Class 8 Mid-Roof Sleeper Cab

4.87230

4.60707

4.39096

Heavy Class 8 High-Roof Day Cab

5.35363

5.04912

4.77407

Heavy Class 8 High-Roof Sleeper Cab

4.62672

4.34185

4.02750

(6)

Advanced, innovative and off-cycle technologies.

For tractors subject to Phase 1 standards, manufacturers must create separate vehicle subfamilies for vehicles that contain advanced or innovative technologies and group those vehicles together in a vehicle subfamily if they use the same advanced or innovative technologies. Manufacturers may generate separate credit allowances for advanced and innovative technologies as specified in § 535.7(f)(1) and (2). For vehicles subject to Phase 2 standards, manufacturers may generate separate credits allowance for off-cycle technologies in accordance with § 535.7(f)(2). Separate credit allowances for advanced technology vehicles cannot be generated but instead manufacturers may use the credit multipliers specified in § 535.7(f)(1)(iv) through model year 2026.

(7)

Certifying across service classes.

Manufacturers may certify Class 7 tractors to Class 8 tractors standards as follows:

(i) A manufacturer may optionally certify 4x2 tractors with heavy heavy-duty engines to the standards and useful life for Class 8 tractors, with no restriction on generating or using fuel consumption credits within the Class 8 averaging set.

(ii) A manufacturer may optionally certify a Class 7 tractor to the standards and useful life applicable to Class 8 tractors. Credit provisions apply as follows:

(A) If a manufacturer certifies all of its Class 7 tractors to Class 8 standards, it may use these Heavy HDV credits without restriction.

(B) This paragraph (c)(7)(ii)(B) applies if a manufacturer certifies some Class 7 tractors to Class 8 standards under this paragraph (c)(7)(ii) but not all of them. If a manufacturer includes Class 7 tractors in a subfamily of Class 8 tractors with an FEL below the standard, exclude the production volume of Class 7 tractors from the credit calculation. Conversely, if a manufacturer includes Class 7 tractors in a subfamily of Class 8 tractors with an FEL above the standard, it must include the production volume of Class 7 tractors in the credit calculation.

(8)

Expanded families.

Manufacturers may combine dissimilar vehicles into single vehicle subfamilies for applying standards and for testing in special circumstances as follows:

(i) For a Phase 1 vehicle model that straddles a roof-height, cab type, or GVWR division, manufacturers can include all the vehicles in the same vehicle family if it certifies the vehicle family to the more stringent standard. For roof height, the manufacturer must certify to the taller roof standard. For cab-type and GVWR, the manufacturers must certify to the numerically lower standard.

(ii) For a Phase 2 vehicle model that includes a range of GVWR values that straddle weight classes, manufacturers may include all the vehicles in the same vehicle family if it certifies the vehicle family to the numerically lower fuel consumption standard from the affected service classes. Vehicles that are optionally certified to a more stringent standard under this paragraph are subject to useful-life and all other provisions corresponding to the weight class with the numerically lower fuel consumption standard. For a Phase 2 tractor model that includes a range of roof heights that straddle subcategories, a manufacturer may include all the vehicles in the same vehicle family if it certifies the vehicle family to the appropriate subcategory as follows:

(A) A manufacturer may certify mid-roof tractors as high-roof tractors, but it may not certify high-roof tractors as mid-roof tractors.

(B) For tractor families straddling the low-roof/mid-roof division, a manufacturer may certify the family based on the primary roof-height as long as no more than 10 percent of the tractors are certified to the otherwise inapplicable subcategory. For example, if 95-percent of the tractors in the family are less than 120 inches tall, and the other 5 percent are 122 inches tall, a manufacturer may certify the tractors as a single family in the low-roof subcategory.

A value is measured. However, use the GEM input for the bin based on the standards to which the manufacturer certifies. For example, of a manufacturer certifies as mid roof tractors some low-roof tractors with a measured C

A value of 4.2 m

, it qualifies as Bin IV; and must input into GEM the mid-roof Bin IV value of 5.85 m

(9)

Vocational tractors.

Tractors meeting the definition of vocational tractors in 49 CFR 523.2 must comply with requirements for heavy-duty vocational vehicles specified in paragraphs (b) and (d) of this section. For Phase 1, Class 7 and Class 8 tractors certified or exempted as vocational tractors are limited in production to no more than 21,000 vehicles in any three consecutive model years. If a manufacturer is determined as not applying this allowance in good faith by

EPA in its applications for certification in accordance with 40 CFR 1037.205 and 1037.610, a manufacturer must comply with the tractor fuel consumption standards in paragraph (c)(3) of this section. No production limit applies for vocational tractors subject to Phase 2 standards.

(10)

Small business manufacturers converting to mid roof or high roof configurations.

Small manufacturers are to allowed convert low and mid roof tractors to high roof configurations without recertification, provided it is for the purpose of building a custom sleeper tractor or conversion to a natural gas tractor as specified in 40 CFR 1037.150(r).

(11)

Useful life.

The following useful life values apply for the standards of this section:

(i) 185,000 miles or 10 years, whichever comes first, for vehicles at or below 33,000 pounds GVWR.

(ii) 435,000 miles or 10 years, whichever comes first, for vehicles above 33,000 pounds GVWR.

(12)

Conversion to high-roof configurations.

Secondary vehicle manufacturers that qualify as small manufacturers may convert low- and mid-roof tractors to high-roof configurations without recertification for the purpose of building a custom sleeper tractor or converting it to run on natural gas, as follows:

(i) The original low- or mid-roof tractor must be covered by a valid certificate of conformity by EPA.

(ii) The modifications may not increase the frontal area of the tractor beyond the frontal area of the equivalent high-roof tractor with the corresponding standard trailer. If a manufacturer cannot use the original manufacturer's roof fairing for the high-roof tractor, use good engineering judgment to achieve similar or better aerodynamic performance.

(iii) The agencies may require that these manufacturers submit annual production reports as described in § 535.8 and 40 CFR 1037.250 indicating the original roof height for requalified vehicles.

(13)

Compliance with standards.

A manufacturer complies with the standards of this part as described in § 535.10.

(d)

Heavy-duty engines.

Each manufacturer of heavy-duty engines shall comply with the fuel consumption standards in this paragraph (d) expressed in gallons per 100 horsepower-hour. Manufacturers must apply the fuel consumption standards in this paragraph (d) to the same engines using the same options used to comply with EPA in 40 CFR 1036.108. Each engine must be manufactured to comply for its full useful life, expressed in service miles, operating hours, or calendar years, whatever comes first. The provisions of this part apply to all new 2014 model year and later heavy-duty engines fueled by conventional and alternative fuels and manufactured for use in heavy-duty tractors or vocational vehicles. Standards apply to the engine and powertrain families and sub-families based upon the primary intended service classes within each of the engine regulatory subcategories as described in§ 535.4 and based upon the applicable modeling and testing specified in § 535.6.

(1)

Mandatory standards.

Manufacturers of heavy-duty engine families shall comply with the mandatory fuel consumption standards in paragraphs (d)(3) through (6) of this section for model years 2017 and later for compression-ignition engines and for model years 2016 and later for spark-ignition engines.

(i) The heavy-duty engine regulatory category is divided into six regulatory subcategories, five compression-ignition subcategories and one spark-ignition subcategory, as shown in Table 14 of this section.

(ii) Separate standards exist for engine families manufactured for use in heavy-duty vocational vehicles and in truck tractors.

(iii) For purposes of certifying engines to fuel consumption standards, manufacturers must divide their product lines in each regulatory subcategory into engine families. Fuel consumption standards apply each model year to the same engine families used to comply with EPA standards in 40 CFR 1036.108 and 40 CFR 1037.230. An engine family is designated under the EPA program based upon testing specified in 40 CFR part 1036, subpart F, and the engine family's primary intended service class. Each engine family manufactured for use in a heavy-duty tractor or vocational vehicle must be certified to the primary intended service class that it is designed for in accordance with 40 CFR 1036.108 and 1036.140.

(2)

Voluntary compliance.

(i) For model years 2013 through 2016 for compression-ignition engine families, and for model year 2015 for spark-ignition engine families, a manufacturer may choose voluntarily to comply with the fuel consumption standards provided in paragraphs (d)(3) through (5) of this section. For example, a manufacturer may choose to comply early in order to begin accumulating credits through over-compliance with the applicable standards. A manufacturer choosing early compliance must comply with all the vehicles and engines it manufacturers in each regulatory category for a given model year except in model year 2013 the manufacturer may comply with individual engine families as specified in 40 CFR 1036.150(a)(2).

(ii) A manufacturer must declare its intent to voluntarily comply with fuel consumption standards and identify its plans to comply before it submits its first application for a certificate of conformity for the respective model year as specified in § 535.8; and, once selected, the decision cannot be reversed and the manufacturer must continue to comply for each subsequent model year for all the vehicles and engines it manufacturers in each regulatory category for a given model year.

(3)

Regulatory subcategory standards.

The primary fuel consumption standards for heavy-duty engine families are given in the following table:

BILLING CODE 4910-59-P

EP13SE22.005

BILLING CODE 4910-59-C

(4)

Alternate subcategory standards.

The alternative fuel consumption standards for heavy-duty compression-ignition engine families are as follows:

(i) Manufacturers entering the voluntary program in model years 2014 through 2016, may choose to certify compression-ignition engine families unable to meet standards provided in paragraph (d)(3) of this section to the alternative fuel consumption standards of this paragraph (d)(4).

(ii) Manufacturers may not certify engines to these alternate standards if they are part of an averaging set in which they carry a balance of banked credits. For purposes of this section, manufacturers are deemed to carry credits in an averaging set if they carry credits from advance technology that are allowed to be used in that averaging set in accordance with § 535.7(d)(12).

(iii) The emission standards of this section are determined as specified by EPA in 40 CFR 1036.620(a) through (c) and should be converted to equivalent fuel consumption values.

(5)

Alternate phase-in standards.

Manufacturers have the option to comply with EPA emissions standards for compression-ignition engine families using an alternative phase-in schedule that correlates with EPA's OBD standards. If a manufacturer chooses to use the alternative phase-in schedule for meeting EPA standards and optionally chooses to comply early with the NHTSA fuel consumption program, it must use the same phase-in schedule beginning in model year 2013 for fuel consumption standards and must remain in the program for each model year thereafter until model year 2020. The fuel consumption standard for each model year of the alternative phase-in schedule is provided in Table 15 of this section. Note that engine families certified to these standards are not eligible for early credits under § 535.7.

BILLING CODE 4910-59-P

EP13SE22.006

BILLING CODE 4910-59-C

(6)

Alternative fuel conversions.

Engines that have been converted to operate on alternative fuels may demonstrate compliance with the standards of this part or other alternative compliance approaches allowed by EPA in 40 CFR 85.525.

(7)

Optional certification under this section.

Manufacturers certifying spark-ignition engines to the compression-ignition standards for EPA must treat those engines as compression-ignition engines for all the provisions of this part.

(8)

Advanced, innovative and off-cycle technologies.

For engines subject to Phase 1 standards, manufacturers must create separate engine families for engines that contain advanced or innovative technologies and group those engines together in an engine family if they use the same advanced or innovative technologies. Manufacturers may generate separate credit allowances for advanced and innovative technologies as specified in § 535.7(f)(1) and (2). For engines subject to Phase 2 standards, manufacturers may generate separate credits allowance for off-cycle technologies in accordance with § 535.7(f)(2). Credit incentives for advanced technology engines do not apply during the Phase 2 period.

(9)

Useful life.

The exhaust emission standards of this section apply for the full useful life, expressed in service miles, operating hours, or calendar years, whichever comes first. The following useful life values apply for the standards of this section:

(i) 120,000 miles or 11 years, whichever comes first, for CI and SI LHD engines certified to Phase 1 standards.

(ii) 150,000 miles or 15 years, whichever comes first, for CI and SI LHD and spark-ignition engines certified to Phase 2 standards.

(iii) 185,000 miles or 10 years, whichever comes first, for CI MHD engines certified to Phase 1 and for Phase 2.

(iv) 435,000 miles or 10 years, whichever comes first, for CI HHD engines certified to Phase 1 and for Phase 2.

(v) For Phase 1 credits that manufacturers calculate based on a useful life of 110,000 miles, multiply any banked credits that it carries forward for use into the Phase 2 program by 1.36. For Phase 1 credit deficits that manufacturers generate based on a useful life of 110,000 miles multiply the credit deficit by 1.36, if offsetting the shortfall with Phase 2 credits.

(10)

Loose engines.

This paragraph (d)(10) describes alternate emission and fuel consumption standards for loose engines certified under. The standards of this paragraph (d) and 1036.108 do not apply for loose engines certified under paragraph (a) of this section and 40 CFR 86.1819- 14(k)(8). The standards in 40 CFR 1036.150(j) apply for the emissions and equivalent fuel consumption measured with the engine installed in a complete vehicle consistent with the provisions of 40 CFR 86.1819-14(k)(8)(vi).

(11)

Alternate transition option for Phase 2 engine standards.

(i) Manufacturers may optionally elect to comply with the model year 2021 primary (Phase 2) vocational vehicle and tractor engine standards in paragraph (d)(3) of this section beginning in model year 2020 (

e.g.,

comply with the more stringent standards one year early). The model year 2021 standard would apply to these manufacturers for model years 2020 through 2023. Manufacturers that voluntarily certify their engines to model year 2021 standards early would then be eligible for less stringent engine tractor standards in model years 2024 through 2026, as follows:

(A) 5.3242 gallons per 100 hp-hr for MHD vocational vehicle engines.

(B) 4.5874 gallons per 100 hp-hr for MHD tractor engines.

(D) 4.3418 gallons per 100 hp-hr for HHD tractor engines.

(ii) The primary standard in paragraph (d)(3) of this section applies for all manufacturers in model year 2027 and later years.

(iii) Manufacturers may apply these provisions separately for medium heavy-duty engines and heavy heavy-duty engines. This election applies to all engines in each segment. For example, if a manufacturer elects this alternate option for its medium heavy-duty engines, all of the manufacturer's medium heavy-duty vocational and tractor engines must comply. Engine fuel consumption credits generated under § 535.7(d) for manufacturers complying early with the model year 2021 standards follow the temporary extended credit life allowance in § 535.7(d)(9).

(12)

Compliance with standards.

A manufacturer complies with the standards of this part as described in § 535.10.

§ 535.6

Measurement and calculation procedures.

This part describes the measurement and calculation procedures manufacturers use to determine annual fuel consumption performance results. Manufacturers use the fuel consumption results determined in this part for calculating credit balances specified in § 535.7 and then determine whether they comply with standards as specified in § 535.10. Manufacturers must use EPA emissions test results for deriving NHTSA's fuel consumption performance rates. Consequently, manufacturers conducting testing for certification or annual demonstration testing and providing CO

emissions data to EPA must also provide equivalent fuel consumption results to NHTSA for all values. NHTSA and EPA reserve the right to verify separately or in coordination the results of any testing and measurement established by manufacturers in complying with the provisions of this program and as specified in 40 CFR 1037.301 and § 535.9. Any carry over data from the Phase 1 program may be carried into the Phase 2 only with approval from EPA and by using good engineering judgment considering differences in testing protocols between test procedures.

(a)

Heavy-duty pickup trucks and vans.

This section describes the method for determining the fuel consumption performance rates for test groups and for fleets of complete heavy-duty pickup trucks and vans each model year. The NHTSA heavy-duty pickup truck and van fuel consumption performance rates correspond to the same requirements for EPA as specified in 40 CFR 86.1819-14.

(1) For the Phase 1 program, if the manufacturer's fleet includes conventional vehicles (gasoline, diesel and alternative fueled vehicles) and advanced technology vehicles (hybrids with powertrain designs that include energy storage systems, vehicles with waste heat recovery, electric vehicles and fuel cell vehicles), it may divide its fleet into two separate fleets each with its own separate fleet average fuel consumption performance rate. For Phase 2, manufacturers may calculate their fleet average fuel consumption rates for a conventional fleet and separate advanced technology vehicle fleets. Advanced technology vehicle fleets should be separated into plug-in hybrid electric vehicles, electric vehicles and fuel cell vehicles.

(2) Vehicles in each fleet should be selected and divided into test groups or subconfigurations according to EPA in 40 CFR 86.1819-14(d).

(3) Use the EPA CO2 emissions test results for each test group, in grams per mile, for the selected vehicles.

(i) Use CO

emissions test results for vehicles fueled by conventional and alternative fuels, including dedicated and dual-fueled (multi-fuel and flexible-fuel) vehicles using each fuel type as specified in 40 CFR 86.1819-14(d)(10).

(ii) Use CO

emissions test results for dual-fueled vehicles using a weighted average of the manufacturer's emission results as specified in 40 CFR 600.510-12(k) for light-duty trucks.

(iii) All electric vehicles are deemed to have zero emissions of CO

, CH

, and N

O. No emission testing is required for such electric vehicles. Assign the fuel consumption test group result to a value of zero gallons per 100 miles in paragraph (a)(4) of this section.

(iv) Use CO

emissions test results for cab-complete and incomplete vehicles based upon the applicable complete sister vehicles as determined in 40 CFR 1819-14(j)(2).

(v) Use CO

emissions test results for loose engines using applicable complete vehicles as determined in 40 CFR 86.1819-14(k)(8).

(vi) Manufacturers can choose to analytically derive CO

emission rates (ADCs) for test groups or subconfigurations. Use ADCs for test groups or subconfigurations in accordance with 40 CFR 86.1819-14 (d) and (g).

(4) Calculate equivalent fuel consumption results for all test groups, in gallons per 100 miles, from CO

emissions test group results, in grams per miles, and round to the nearest 0.001 gallon per 100 miles.

(i) Calculate the equivalent fuel consumption test group results as follows for compression-ignition vehicles and alternative fuel compression-ignition vehicles. CO

emissions test group result (grams per mile)/10,180 grams per gallon of diesel fuel) × (10

) = Fuel consumption test group result (gallons per 100 mile).

(ii) Calculate the equivalent fuel consumption test group results as follows for spark-ignition vehicles and alternative fuel spark-ignition vehicles. CO

emissions test group result (grams per mile)/8,877 grams per gallon of gasoline fuel) × (10

) = Fuel consumption test group result (gallons per 100 mile).

(5) Calculate the fleet average fuel consumption result, in gallons per 100 miles, from the equivalent fuel consumption test group results and round the fuel consumption result to the nearest 0.001 gallon per 100 miles. Calculate the fleet average fuel consumption result using the following equation.

EP13SE22.001

Where:

Fuel Consumption Test Group Result

= fuel consumption performance for each test group as defined in 49 CFR 523.4.

Volume

= production volume of each test group.

(6) Compare the fleet average fuel consumption standard to the fleet average fuel consumption performance. The fleet average fuel consumption performance must be less than or equal to the fleet fuel consumption standard to comply with standards in § 535.5(a).

(b)

Heavy-duty vocational vehicles and tractors.

This section describes the method for determining the fuel consumption performance rates for vehicle families of heavy-duty vocational vehicles and tractors. The NHTSA heavy-duty vocational vehicle and tractor fuel consumption performance rates correspond to the same requirements for EPA as specified in 40 CFR 1037, subpart F.

(1) Select vehicles and vehicle family configurations as specified in 40 CFR 1037.150 and 1037.230 for vehicles that make up each of the manufacturer's regulatory subcategories of vocational vehicles and tractors. For the Phase 2 program, select powertrain, axle and transmission families in accordance with 40 CFR 1037.231 and 1037.232.

(2) Follow the EPA testing requirements in 40 CFR 1037.230 and 1037.501 to derive inputs for the Greenhouse gas Emissions Model (GEM).

(3) Enter inputs into GEM, in accordance with 40 CFR 1037.520, to derive the emissions and fuel consumption performance results for all vehicles (conventional, alternative fueled and advanced technology vehicles).

(4) For Phase 1 and 2, all of the following GEM inputs apply for vocational vehicles and other tractor regulatory subcategories, as follows:

(i) Model year and regulatory subcategory (see § 535.3 and 40 CFR 1037.230).

(ii) Coefficient of aerodynamic drag (C

A) or drag area, as describ

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