# Corporate Average Fuel Economy (CAFE): A Comparison of Selected Legislation in the 110th Congress

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URL: https://www.frixlaw.com/law-library/documents/crs%3ARL33982

## Record

- **Collection:** Congressional research report
- **Document type:** CRS Report
- **Published:** August 16, 2007
- **Citation:** RL33982

## Text

Order Code RL33982

Corporate Average Fuel Economy (CAFE):
A Comparison of Selected Legislation in
the 110th Congress

Updated August 16, 2007

Brent D. Yacobucci
Specialist in Energy Policy
Resources, Science, and Industry Division
Robert Bamberger
Specialist in Energy Policy
Resources, Science, and Industry Division

Corporate Average Fuel Economy (CAFE):
A Comparison of Selected Legislation in
the 110th Congress
Summary
The rise in crude oil and gasoline prices since the winter of 2006 has renewed
the focus on U.S. fuel consumption in the transportation sector. Wider concerns over
greenhouse gas emissions and climate change have contributed to interest in reducing
fossil fuel consumption and improving the efficiency of the U.S. transportation
sector. Possible changes to the federal Corporate Average Fuel Economy (CAFE)
standards are one policy option to address the issue.
CAFE standards are fleetwide fuel economy averages that manufacturers must
meet each model year. Currently, separate CAFE standards are established for
passenger cars and light trucks, which include sport utility vehicles (SUVs), vans,
and pickup trucks. Several bills have been introduced in the 110th Congress to
modify the CAFE program. Senate energy legislation, H.R. 6, passed that body on
June 21, 2007; the bill includes language on CAFE. On August 3, 2007, the House
passed energy legislation — H.R. 3221 (241-170) and H.R. 2776 (221-189) — but
these bills did not include CAFE provisions. Two House bills addressing CAFE
(H.R. 1506, H.R. 2729) were circulated as possible amendments, but neither were
debated on the House floor.
This report provides a side-by-side comparison of these and other bills in the
110 Congress addressing passenger vehicle fuel economy in general and the CAFE
program specifically. The bills are compared on various policy options including, but
not limited to, the types of provisions identified above. The report also compares
provisions in bills that would establish greenhouse gas emissions standards for
passenger cars outside of the CAFE structure. Such emissions standards would likely
also have the effect of increasing fuel economy.
th

One issue in the CAFE debate over the years has been whether Congress should
set CAFE standards or delegate that authority exclusively to NHTSA. For passenger
cars, the original EPCA legislation established specific targets for model year (MY)
1978 and MY1985, and required that the Secretary of Transportation set standards
for the interim years. Some of the current proposals would also set specific targets
in the future; others would require annual improvements in CAFE by some specified
percentage. In some instances, both approaches are used. Those proposals would
establish a mandated CAFE by a certain date and require subsequent annual
percentage increases. Some bills would also require NHTSA to set the maximum
feasible interim standards.
Another key question is the form CAFE standards should take. One bill would
require that the CAFE standard be expressed in grams per mile of carbon dioxide
emissions (CO2), in addition to miles per gallon. States are pre-empted from
establishing their own CAFE standards but are permitted to set clean air
requirements. This has generated controversy, and some believe a requirement to
report fuel economy as a function of CO2 emissions is intended to have some bearing
on the differing treatment of the states between CAFE and emissions standards.

Contents
Background: Establishment of the CAFE Standards . . . . . . . . . . . . . . . . . . . . . . . 1
Recent CAFE Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Policy Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Policy Options Within CAFE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Combined Passenger Car/Light Truck Standards . . . . . . . . . . . . . . . . . 3
Definition of “Automobile” and “Light Truck” . . . . . . . . . . . . . . . . . . . 3
Mandated Numeric Increase in CAFE Standards . . . . . . . . . . . . . . . . . 3
Mandated Percentage Increase in CAFE Standards . . . . . . . . . . . . . . . . 3
Regulatory Flexibility/Authority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Expanded Considerations for Maximum Feasible Fuel Economy . . . . . 4
Attribute-Based Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Credit Trading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Carbon Dioxide Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Bush Administration Proposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Non-CAFE Policy Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Comparison of Legislation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

List of Tables
Table 1. Comparison of Senate CAFE Bills in the 110th Congress . . . . . . . . . . . 7
Table 2. Comparison of House CAFE Bills in the 110th Congress . . . . . . . . . . . 13
Table 3. Comparison of Bills To Establish Automobile Greenhouse Gas
Standards in the 110th Congress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Corporate Average Fuel Economy (CAFE):
A Comparison of Selected Legislation
in the 110th Congress
The rise in crude oil and gasoline prices since the winter of 2006 has renewed
the focus on U.S. fuel consumption in the transportation sector. Wider concerns over
greenhouse gas emissions and climate change have contributed to interest in reducing
fossil fuel consumption and improving the efficiency of the U.S. transportation
sector. Among the various policy options to address the issue are changes to the
federal Corporate Average Fuel Economy (CAFE) standards.1 CAFE refers to the
average miles per gallon used by a manufacturer’s entire fleet of cars or light trucks
in a given model year.
Various bills in the 110th Congress would modify the CAFE program to increase
fuel economy standards for all vehicles, heighten the stringency of testing procedures,
and/or grant the National Highway Traffic Safety Administration (NHTSA) broader
authority to implement the program. In the Senate, S. 357 was reported, as amended,
from the Committee on Commerce, Science, and Transportation on May 8, 2007.
Some of its provisions were inserted, along with other energy initiatives reported
from committee, into S.Amdt. 1502 to H.R. 6. H.R. 6 passed the Senate June 21,
2007 and includes CAFE language.
On August 3, 2007, the House passed energy legislation — H.R. 3221 (241-170)
and H.R. 2776 (221-189) — but these bills did not include CAFE provisions. Two
House bills addressing CAFE (H.R. 1506, H.R. 2729) were circulated as possible
amendments, but neither were debated on the House floor. Some argued that it would
strengthen House negotiations with the Senate in conference if the House bill had
also included CAFE provisions. An effort to add CAFE language to House energy
legislation was defeated on June 28th in a House Committee on Energy and
Commerce markup (26-31). It is possible that provisions of H.R. 1506 and H.R. 2927
may figure in discussions should an energy bill reach conference.

Background: Establishment of the CAFE Standards
The Arab oil embargo of 1973-1974 and the subsequent tripling in the price of
crude oil brought into sharp focus the fuel inefficiency of U.S. automobiles. New car
fleet fuel economy had declined from 14.8 miles per gallon (mpg) in model year
(MY) 1967 to 12.9 mpg in 1974. In the search for ways to reduce dependence on
imported oil, automobiles were an obvious target. The Energy Policy and

1

For more information on CAFE, see CRS Report RL33413, Automobile and Light Truck
Fuel Economy: The CAFE Standards, by Brent D. Yacobucci and Robert Bamberger.

CRS-2
Conservation Act (EPCA, P.L. 94-163) established CAFE standards for passenger
cars for MY1978. The CAFE standards called for an eventual doubling in new car
fleet fuel economy. EPCA also granted NHTSA the authority to establish CAFE
standards for other classes of vehicles, including light-duty trucks.2 NHTSA
established fuel economy standards for light trucks, beginning in MY1979. For
passenger cars, the current standard is 27.5 miles per gallon (mpg) for MY2007. For
light trucks, the standard is 22.2 mpg for MY2007.
Under EPCA, the Secretary of Transportation has the discretion to adjust the
passenger car standard within a range from 26.0 to 27.5 mpg. Any increase above
27.5 mpg or below 26.0 mpg requires the Secretary to issue an amendment to the
standards. That amendment would be in force unless either chamber of Congress
disapproves. However, this one-House veto could be judged to be unconstitutional.3
The Secretary has much broader discretion with respect to setting light truck fuel
economy standards (referred to in the regulations as “non-passenger automobiles”).
This includes the authority to establish different standards for different classifications
of these vehicles.

Recent CAFE Regulations
In April 2006, NHTSA promulgated new CAFE rules for light trucks. After
MY2007, light truck manufacturers may voluntarily comply with a new “reformed”
standard based on the size of each specific manufacturer’s vehicles. Starting in
MY2011, all light truck makers will be subject to the reformed standards, which
NHTSA estimates will be equivalent to about 24.0 mpg under the old system. EPCA
gives NHTSA the authority to modify the light truck standards as it sees fit, including
setting standards based on vehicle attributes (in this case, size). EPCA does not grant
similar flexibility in application of the passenger car standard.

Policy Options
Policy Options Within CAFE
Several bills would amend the current CAFE program to increase CAFE
standards, change testing procedures, and/or grant NHTSA broader regulatory
discretion. CRS analyzed 12 CAFE-related bills with regard to several key policy
options:
!
!
!
!

2
3

combined passenger car/light truck standards,
definition of “automobile” and “light truck,”
mandated numeric increase in CAFE standards,
mandated percentage increase in CAFE standards,

Light-duty trucks include most sport utility vehicles (SUVs), vans, and pickups.

For more information see CRS Report RS22132, Legislative Vetoes After Chadha, by
Louis Fisher.

CRS-3
!
!
!
!
!
!

regulatory flexibility/authority,
expanded considerations for maximum feasible fuel economy,
attribute-based standards,
credit trading,
carbon dioxide emissions, and
other key provisions.

None of these policy options is mutually exclusive, and any or all options could be
adopted together. Each of these options is discussed below.
Combined Passenger Car/Light Truck Standards. One criticism of the
current CAFE program is its separate treatment of light trucks and passenger cars.
When EPCA was first enacted, most light trucks were used solely as work vehicles,
and they constituted a relatively small percentage of the light-duty vehicle fleet.
Since that time, light trucks, which include sport utility vehicles (SUVs) and vans,
are used more and more as passenger vehicles. Currently, light trucks make up
roughly half of the new light-duty vehicle market. As a consequence, some argue
that the distinction between the two fleets should be eliminated. Critics also allege
that specifications for some car-like vehicle models may have been designed
purposefully to qualify those vehicles for the lower mpg standard that applies to the
light truck fleet.
Definition of “Automobile” and “Light Truck”. Passenger car and light
truck standards could be combined by simply expanding the definition of “passenger
automobile” to include light trucks up to 8,500 pounds. Some proponents of tighter
standards argue that light trucks should be treated as passenger vehicles.
Further, some light trucks are too heavy to be included under the current CAFE
standard. Therefore, some proposals would expand the definition of “automobile”
or “light truck” to include all vehicles up to 10,000 pounds gross weight (current
standards cover vehicles up to 8,500 pounds gross weight). Other proposals would
expand CAFE standards to some heavier vehicles (e.g. SUVs and passenger vans) but
would exclude “work trucks” (e.g. pickups and cargo vans).
Mandated Numeric Increase in CAFE Standards. Some analysts argue
that price volatility in oil markets sends inconsistent signals to prospective new car
purchasers, and that the only way to avoid these mixed signals would be to mandate
higher CAFE standards. Some legislative proposals would require NHTSA to
establish new CAFE standards set at a fixed mpg target in a given year. Various
proposals would mandate increased standards for passenger cars, light trucks, or
both.
Mandated Percentage Increase in CAFE Standards. While some bills
would mandate an increase in the CAFE standards to specified levels, others would
require NHTSA to set rules to increase fuel economy by a set percentage every year.
In most cases, the bills mandate an annual CAFE increase of 4% from the previous
year. The bills vary on whether the increase would cover passenger cars, light trucks,
or both.

CRS-4
Regulatory Flexibility/Authority. As was mentioned above, NHTSA
currently has limited authority to modify the specific mpg target or the general design
of passenger car CAFE standards. Some legislative proposals would significantly
broaden NHTSA’s authority to amend the program, including allowing NHTSA to
set higher passenger car standards than EPCA currently allows. Currently, any
increase above 27.5 mpg or below 26.0 mpg requires the Secretary to issue an
amendment to the standards. That amendment is to be in force unless either chamber
of Congress disapproves.
Other proposals would allow NHTSA to extend the current single-year
compliance period to multiyear periods. Such a proposal, for example, might allow
NHTSA to require manufacturers to meet a set CAFE average for MY2011 through
MY2013, instead of requiring that the CAFE average be achieved in each model year.
Expanded Considerations for Maximum Feasible Fuel Economy.
Current law requires NHTSA to consider various factors in determining “maximum
feasible average fuel economy.” NHTSA must consider “technological feasibility,
economic practicability, the effect of other motor vehicle standards of the
government on fuel economy, and the need of the United States to conserve energy.”4
Some of the bills would add a further dimension, “cost-effectiveness,” and stipulate
weighing of several factors in assessing the cost-effectiveness of any proposed
changes in the standards. Among these factors are value to consumers, economic
security, national security, foreign policy, and the impact of oil use on various other
national policy concerns.
Attribute-Based Standards. As noted above, NHTSA has established sizebased CAFE standards for light trucks but does not have similar authority for
passenger cars. Some proposals would allow NHTSA to establish multiple levels of
passenger car CAFE standards for a given model year. The levels could be based on
a variety of vehicle attributes, including size and/or weight. The Senate-passed H.R.
6 would require attribute-based standards. H.R. 6 would also require that, after
enactment, the Secretary of Transportation would initiate a study toward developing
a fuel economy program to raise the vehicle fuel efficiency of medium- and heavyduty trucks.
Credit Trading. For each model year, automakers must meet separate CAFE
targets for three new vehicle fleets: domestically produced passenger cars, imported
passenger cars, and light trucks. In any year that a manufacturer exceeds the CAFE
standard for one of these given fleets, that manufacturer may “bank” credits for use
in meeting future year requirements. Conversely, in any year that the manufacturer
comes up short, it may “borrow” credits from an anticipated surplus in future years.
Under the current CAFE program, banked or borrowed credits may be used only for
the fleet in which they originated. For example, if an automaker generates credits for
its fleet of imported passenger cars, those credits may not be applied to its fleets of
domestic cars or light trucks. Similarly, automakers may not trade credits with other
automakers. However, some of the legislative proposals would allow a manufacturer
to move credits between fleets and/or trade credits with another manufacturer.

4

49 U.S.C. 32902(f)

CRS-5
Carbon Dioxide Standards. One bill, H.R. 2927, would require that new
CAFE standards be expressed in grams per mile of carbon dioxide (CO2), in addition
to miles per gallon. Under EPCA, states are pre-empted from establishing their own
CAFE standards. But the Clean Air Act permits states to set their own clean air
requirements. This has generated controversy, and some believe a requirement to
report fuel economy as a function of CO2 emissions is intended to have some bearing
on the differing treatment of the states between CAFE and emissions standards.
Some of these matters are currently being litigated.

Bush Administration Proposal
In his 2007 State of the Union address, President Bush outlined a goal of
reducing gasoline5 consumption by 20% from projected levels in 2017. Of that 20%
reduction, the President proposed that 15% come from the increased use of renewable
and alternative fuels, and that 5% come from increased vehicle fuel efficiency. It has
been estimated that an annual 4% increase in CAFE standards would lead to a 5%
reduction in projected gasoline consumption in 2017. The Bush Administration has
not proposed legislation that would mandate an increase in CAFE standards.
On February 6, 2007, NHTSA submitted draft legislation to the House Energy
and Commerce Committee on the Bush Administration’s CAFE proposal.6 The
Administration’s proposal would not require an increase in fuel economy standards
but would grant NHTSA broader regulatory authority. The draft would allow
NHTSA to establish attribute-based standards for passenger cars and would allow for
CAFE credit trading.

Non-CAFE Policy Options
In addition to bills modifying the CAFE program, several other bills have been
introduced that would likely increase vehicle fuel economy through other measures.
For example, several bills requiring reductions in carbon dioxide and other
greenhouse gas emissions have been introduced. Of those bills, two would require
per-mile emissions reductions from passenger vehicles. While such emissions
standards would not technically constitute a change in fuel economy standards,
automakers and others contend that there is no way other than fuel economy increases
to reduce automobile greenhouse gas emissions.7

5

Gasoline is only one part of oil consumption (albeit the largest), and thus a 20% reduction
in gasoline consumption translates to a smaller reduction in overall petroleum consumption.

6

As of February 22, 2007, no Member has sponsored and introduced the Administration’s
proposal.

7

For more information on climate change bills, see CRS Report RL33846, Climate Change:
Greenhouse Gas Reduction Bills in the 110th Congress, by Larry Parker and Brent D.
Yacobucci.

CRS-6

Comparison of Legislation
Of the 14 CAFE bills compared, the eight Senate bills are compared in Table
1 and the four House bills are compared in Table 2. The two bills to control
greenhouse gas emissions from passenger cars are compared in Table 3.

CRS-7

Table 1. Comparison of Senate CAFE Bills in the 110th Congress
S. 183
(Stevens)

S. 357 (Feinstein)
[as introduced]

S. 767 / S. 768
(Obama)

S. 875
(Lugar)

S. 1118
(Dorgan)

H.R. 6 - Senate
Version (Reid)

Bill Title

Improved Passenger
Automobile Fuel
Economy Act of 2007

Ten-in-Ten Fuel
Economy Act

Fuel Economy Reform
Act

Security and Fuel
Efficiency (SAFE)
Energy Act of 2007

Fuel Efficiency
Energy Act of 2007

Ten-in-Ten Fuel
Economy Act

Combined
Passenger
Car/Light Truck
Standards

No provision.

Passenger car and light
truck standards
combined starting in
MY2013. [Sec. 2]

Passenger car and light
truck standards
combined starting in
MY2013. [Sec. 4]

No provision.

No provision.

Passenger car and light
truck standards
combined starting in
MY2011. [Sec. 502]

Change in
Definition of
“Automobile” or
“Light Truck”

No provision

Expands light truck
definition to include
vehicles between
8,500 and 10,000
pounds that are not
“work trucks” — i.e.
not heavier pickups
and vans [Sec. 5]

Expands definition of
“passenger
automobile” to include
all vehicles of up to
10,000 pounds
designed to carry less
than 10 passengers.
[Sec. 3]

Establishes that 4wheel drive is neither
necessary nor
sufficient to qualify
vehicle as a light-duty
truck. [Sec. 2]

Establishes that 4wheel drive is neither
necessary nor
sufficient to qualify
vehicle as a light-duty
truck. [Sec. 2]

Includes light trucks
between 8,500 and
10,000 pounds that are
not “work trucks” —
i.e. not heavier
pickups and vans.
[Sec. 504]

Mandated
Numeric Increase
in CAFE
Standards

40 mpg for passenger
cars only by MY2017.
During interim, the
Secretary of
Transportation must
set standards for each
individual
manufacturer at
maximum feasible
level. [Sec. 101]

35 mpg for combined
fleets by MY2019.
[Sec. 2]

27.5 mpg for
combined fleets by
MY2013. [Sec. 4]

No provision.

No provision.

35 mpg for combined
automobile and light
truck fleets by
MY2020. [Sec. 502]

Interim MY2010
standards of 29.5 mpg
for passenger cars and
25.5 mpg for light
trucks. [Sec. 2]

CRS-8
S. 183
(Stevens)
Mandated
Percentage
Increase in CAFE
Standards

An annual, fixed
percentage increase is
specifically prohibited.
[Sec. 101]

S. 357 (Feinstein)
[as introduced]
No provision.

S. 767 / S. 768
(Obama)

S. 875
(Lugar)

S. 1118
(Dorgan)

H.R. 6 - Senate
Version (Reid)

For MY2010 through
MY2012, requires a
4% annual increase in
passenger car fuel
economy. [Sec.
106(a)(3)]

For MY2013 through
MY2030, requires a
mandatory annual fuel
economy increases of
4% for each class of
vehicles. [Sec. 102]

Starting in MY2013,
requires that CAFE
standard for each class
of vehicles be
increased by 4% over
the previous model
year’s standard. [Sec.
3]

Requires the Secretary
of Transportation to
establish procedures to
ensure the maximum
feasible increase in
fuel efficiency for
medium- and heavyduty commercial
vehicles. [Sec. 502]

The Secretary shall
establish average fuel
economy standards for
medium-duty trucks
that are consistent with
the projected benefits
of hybridization. In
this section, the term
‘medium-duty truck’
means a truck (as
defined in section
30127) with a gross
vehicle weight
between 10,000 and
26,000 pounds.

Same as S. 875.

Would require the
Secretary of
Transportation, 18
months after
enactment, to initiate a
study that could lead
to the establishment of
fuel economy
standards, or other
policies, to improve
the fuel efficiency of
medium- and heavyduty on-highway
trucks. Any program
would provide a lead
time of 4 model years
and make no changes
in any targets at less
than three-year

Starting in MY2013,
establishes a
mandatory annual fuel
economy increase of
4% for passenger cars
and light trucks
combined. [Sec.
106(a)(3)]
Improving Fuel
Efficiency of
Medium and
Heavy-Duty
Trucks

No comparable
provision

No comparable
provision.

No comparable
provision.

CRS-9
S. 183
(Stevens)

S. 357 (Feinstein)
[as introduced]

S. 767 / S. 768
(Obama)

S. 875
(Lugar)

S. 1118
(Dorgan)

H.R. 6 - Senate
Version (Reid)
intervals.

Regulatory
Flexibility/
Authority

NHTSA is authorized
to establish multiyear
compliance periods
instead of the current
single-year
compliance period.
[Sec. 101]
Standards may be set
individually for
different classes of a
manufacturer’s fleet of
passenger
automobiles. [Sec.
101]

Expanded
Considerations
for Maximum
Feasible Fuel
Economy

No provision.

NHTSA is given
broader authority to
increase passenger car
fuel economy without
congressional
approval. [Sec. 3]
NHTSA may set
different CAFE targets
for different
manufacturers, but in
any given year each
manufacturer must
achieve a minimum
average of 92% of the
industry-wide CAFE
target. [Sec. 2]

No provision.

NHTSA may set lower
standards for a model
year if the targets are
not technologically
achievable, would lead
to reductions in
vehicle safety, or are
not cost-effective.
[Sec. 4]

NHTSA may set lower
standards for a model
year if the targets are
not technologically
achievable, would lead
to reductions in
vehicle safety, or are
not cost-effective.
[Sec. 102]

NHTSA may set lower
standards for a model
year if the targets are
not technologically
achievable, would lead
to reductions in
vehicle safety, or are
not cost-effective.
[Sec. 3]

NHTSA is given
broader authority to
increase passenger car
fuel economy without
congressional
approval. [Sec. 502]

Substantially similar to
S. 767/768.

Substantially similar to
S. 767/768.

Substantially similar
to S. 767/768.

NHTSA may establish
multiyear compliance
periods (up to four
years). [Sec. 5]
NHTSA may set
different CAFE targets
for different
manufacturers, but in
any given year each
manufacturer must
achieve a minimum
average of 92% of the
industry-wide target.
[Sec. 4]
Cost-effectiveness is
added to the list of
factors for NHTSA to
consider in
determining maximum
feasible fuel economy.

Secretary may set a
standard that is lower
than the “maximum
feasible” level if there
is “clear and
convincing evidence”
that this level can be
demonstrated to not be
“cost-effective.” [Sec.
503]

CRS-10
S. 183
(Stevens)

S. 357 (Feinstein)
[as introduced]

S. 767 / S. 768
(Obama)

S. 875
(Lugar)

S. 1118
(Dorgan)

H.R. 6 - Senate
Version (Reid)

Cost-effectiveness
would be measured
relative to several
criteria, including
value to consumers,
economic security,
national security,
foreign policy, and the
impact of oil use on
various other national
policy concerns. [Sec.
4]
Attribute-Based
Standards

NHTSA is given
authority to establish
attribute-based
standards. [Sec. 101]

No provision.

Starting in MY2013,
NHTSA is given
authority to establish
attribute-based
standards. [Sec. 4]

No provision.

No provision.

NHTSA is required to
establish attributebased standards. [Sec.
502]

CRS-11
S. 183
(Stevens)

S. 357 (Feinstein)
[as introduced]

S. 767 / S. 768
(Obama)

Credit Trading

Greenhouse gas credits
registered with a
national registry may
be purchased by
manufacturers and
applied to fleet fuel
economy results after
MY2010. However,
credits purchased
through the registry
cannot offset more
than 10% of the fuel
economy standard.
[Sec. 102, 201]

Manufacturers may
trade credits between
fleets and with other
manufacturers. [Sec.
9]

Before MY2013,
manufacturers are
allowed to trade
credits with other
manufacturers for the
same fleet (e.g.
domestic passenger
cars). Starting in
MY2013,
manufacturers may
trade credits with other
manufacturers across
all fleets. However, in
the absence of such
credits, each fleet must
achieve at least 92% of
the overall CAFE
target. [Sec. 5]

No provision.

No provision.

Substantially similar to
S. 357. [Sec. 506]

Carbon Dioxide
Standards

No provision.

No provision.

No provision.

No provision.

No provision.

No provision.

Other Key CAFERelated
Provisions

The Secretary of
Transportation may
not set standards that
impose “marginal
costs that exceed
marginal benefits.”
[Sec. 101]

Starting in MY2014,
automakers must
install devices to
provide real-time and
cumulative fuel
economy data that will
enable drivers to
operate their vehicles
to use fuel more
efficiently. [Sec. 7]

No provision.

Existing incentives
within the CAFE
program for the
production of dualfuel and flexible fuel
vehicles are
eliminated. [Sec.
102(b)]

Broadens authority of
NHTSA to establish
standards for a broader
population of vehicles,
including vehicles
with gross vehicle
weight of 10,00026,000 pounds. [Sec.
2]

NHTSA must develop
a “motor vehicle
safety standard” to
reduce death and
injury by improving
compatibility of large
and small vehicles in
frontal- and sideimpacts. [Sec. 505]

Beginning in
MY2012, existing
incentives within the

The National
Academy of Sciences
(NAS) will conduct a

A “national registry
system” for voluntary
greenhouse gas trading
would be established.
The Secretary of

In order to reduce the
likelihood of death or

S. 875
(Lugar)

Requires NHTSA to
set fuel economy
standards for mediumduty vehicles (vehicles

S. 1118
(Dorgan)

H.R. 6 - Senate
Version (Reid)

CRS-12

Other Key NonCAFE Provisions

S. 183
(Stevens)

S. 357 (Feinstein)
[as introduced]

Transportation,
working with the
Department of
Commerce, will
determine the
equivalency between
fuel economy
improvements and
greenhouse gas
reductions. [Sec. 201]

injury from accidents,
NHTSA is required to
develop vehicle
ratings and standards
to reduce damage by
improving
compatibility of large
and small vehicles in
frontal- and sideimpacts. [Sec. 6]

No provision.

Requires the
Environmental
Protection Agency to
establish a program to
label new vehicles’
expected lifetime
greenhouse gas
emissions. [Sec. 11]

S. 767 / S. 768
(Obama)

S. 875
(Lugar)

S. 1118
(Dorgan)

H.R. 6 - Senate
Version (Reid)

with a gross weight
between 10,000 and
26,000 pounds). [Sec.
102(a)]

CAFE program for the
production of dualfuel and flexible fuel
vehicles are
eliminated. [Sec.3]

study of current and
potential technologies
that might contribute
to meeting CAFE
standards. [Sec. 509]
Requires establishment
of a tire fuel efficiency
consumer information
program.[Sec. 513]

S. 768 also modifies
existing tax credits for
hybrid vehicles and
establishes a
manufacturer tax
credit for advanced
technology vehicles.

This is a broad bill that
also: modifies the
existing hybrid vehicle
purchase tax credit and
establishes a tax credit
for fuel-efficient
vehicles; establishes a
manufacturer’s tax
credit for advanced
technology vehicles;
modifies the existing
mandate for renewable
fuels; promotes
renewable fuel
infrastructure;
mandates the
production of
alternative fuel
vehicles; limits oil
exploration in certain
areas.

From MY2012-2022,
manufacturers must
produce not less than
10% more dual-fueled
vehicles than in the
preceding model year.
[Sec. 3]

Among a number of
additional provisions,
would require
establishment of an
Advanced Battery
Initiative to award
grants and identify
technological needs;
promulgation of
standards for biodiesel
fuel; and establishment
of a credit-trading
program; and sets
requirements for
manufacture of
flexible-fuel vehicles
and raising consumer
awareness about
availability of these
vehicles.

CRS-13

Table 2. Comparison of House CAFE Bills in the 110th Congress
H.R. 656 (Reichert)

H.R. 1133 (Berkley)

H.R. 1500 (DeFazio)

H.R. 1506 (Markey)

H.R. 2927
(Hill)

Bill Title or
Purpose

To require higher standards
of automobile fuel
efficiency with the goal of
reducing the amount of oil
used for fuel by
automobiles in the United
States by 10 percent
beginning in 2017, and for
other purposes.

Freedom through
Renewable Energy
Expansion (FREE) Act

Gasoline Price Stabilization
Act of 2007

Fuel Economy Reform Act

To increase the corporate
average fuel economy
standards for auto-mobiles,
to promote the domestic
development and
production of advanced
technology vehicles, and
for other purposes.

Combined
Passenger
Car/Light Truck
Standards

No provision.

No provision.

No provision.

Passenger car and light
truck standards combined
starting in MY2011. [Sec.
4]

No provision.

Change in
Definition of
“Automobile” or
“Light Truck”

No provision.

No provision.

No provision.

Expands definition of
“automobile” to include all
vehicles of up to 10,000
pounds. [Sec. 3]

No provision.

Mandated
Numeric Increase
in CAFE
Standards

33 mpg by MY2017;
interim standards would be
set by Secretary of
Transportation beginning in
MY2010 to reach the
mandated target. [Sec. 1]

33 mpg by MY2016;
interim standards would be
set by Secretary of
Transportation beginning in
MY2010 to reach the
mandated target. [Sec. 8]

37 mpg by MY2018 and 40
mpg by MY2023; interim
standards would be set by
Secretary of Transportation
beginning in MY2010 to
reach the mandated target.
[Sec. 9]

Mandates “a projected level
of average fuel economy”
of at least 27.5 mpg for
vehicles up to 10,000
pounds beginning in
MY2012, and 35 mpg in
MY2018.

Projected fuel economy for
passenger and nonpassenger automobiles
would be not less than 32
mpg or greater than 35 mpg
in MY2022. [Sec. 1]

CRS-14
H.R. 656 (Reichert)

H.R. 1133 (Berkley)

H.R. 1500 (DeFazio)

H.R. 1506 (Markey)

H.R. 2927
(Hill)

Mandated
Percentage
Increase in CAFE
Standards

No provision.

No provision.

No provision.

Requires that current 27.5
mpg standard for passenger
automobiles be increased
4% annually beginning in
MY2009. [Sec. 4]

No provision.

Regulatory
Flexibility/
Authority

No provision.

No provision.

No provision.

National Highway Traffic
Safety Administration
(NHTSA) may set lower
standards for a
manufacturer for a model
year if the targets are not
technologically achievable,
or are not cost-effective;
and if a lower standard
during MY2012-MY2017
would not result in a failure
to attain 35 mpg in
MY2018. [Sec. 4]

No comparable provision.

Expanded
Considerations for
Maximum Feasible
Fuel Economy

No provision.

No provision.

No provision.

Cost-effectiveness is added
to the list of factors for
NHTSA to consider in
determining maximum
feasible fuel economy.
Cost-effectiveness would
be measured relative to
several criteria, including
value to consumers,
economic security, national
security, foreign policy, and
the impact of oil use on
various other national
policy concerns. [Sec.
4(a)(3)]

No provision.

CRS-15
H.R. 656 (Reichert)

H.R. 1133 (Berkley)

H.R. 1500 (DeFazio)

H.R. 1506 (Markey)

H.R. 2927
(Hill)

Attribute-Based
Standards

Authorizes Secretary to
establish size-based
standards for different
classes of vehicles. [Sec. 1]

No provision.

Authorizes Secretary to
establish size-based
standards for different
classes of vehicles. [Sec. 9]

Extends flexibility to
Secretary to establish
attribute-based standards
(including size) for
different classes of
vehicles, or in the form of a
mathematical function.
[Sec. 4]

Extends flexibility to
Secretary to establish
attribute-based standards
(including size) for
different classes of
vehicles, or in the form of a
mathematical function.
[Sec. 1]

Changes in Test
Procedures

No provision.

No provision.

No provision.

Requires joint report from
the Departments of
Transportation and Energy,
and the Environmental
Protection Agency that, in
part, assesses the accuracy
of CAFE test procedures
used to measure fuel
economy, and to “identify
any additional factors or
methods that” would
contribute to the tests’ more
accurately reflecting in-use
fuel economy. [Sec. 4]

No provision; however,
would require that annual
standards also be expressed
in the equivalent of
average grams per mile of
carbon dioxide emissions.

Credit Trading

Authorizes Secretary to
establish a credit trading
program. [Sec. 2]

No provision.

No provision.

No provision.

Authorizes Secretary to
establish a credit trading
program. [Sec. 1]

CRS-16
H.R. 656 (Reichert)

H.R. 1133 (Berkley)

H.R. 1500 (DeFazio)

H.R. 1506 (Markey)

H.R. 2927
(Hill)

Carbon Dioxide
Standards

No provision.

No provision.

No provision.

No provision.

Requires Secretary to
establish fuel economy
standards both in terms of
miles per gallon and grams
per mile of carbon dioxide.
[Sec. 1]

Other Key CAFERelated Provisions

Preamble states that the
bill’s intention is to de facto
reduce the amount of oil
used in automobiles by
10% beginning in 2017.

Advises Secretary that
interim standards not only
reach mandated 33 mpg by
MY2016, but maximize
retention of jobs in the
sector, and not degrade
safety of automobiles. [Sec.
8]

Advises Secretary that
interim standards not only
reach mandated goals, but
maximize retention of jobs
in the sector, and not
degrade safety of
automobiles. [Sec. 9]

Act is not intended to
“limit, constrain, supersede,
or expand” authorities for
prescribing motor vehicle
safety standards. [Sec. 5]

Establishes fund for
domestic
commercialization and
production of advanced
technology vehicles and
components. Fund will be
financed by civil penalties
collected for noncompliance with fuel
economy standards. [Sec.
1]

Advises Secretary that
interim standards not only
reach mandated 33 mpg by
MY2016, but also must
maximize retention of jobs
in the sector, and not
degrade safety of
automobiles. [Sec. 1]

Requires Executive Branch
agencies to improve the
average fuel economy of
new vehicles in each
vehicle class by 3 mph by
MY2011, and 6 mpg by
MY2014 over a baseline
calculated for all vehicles in
the MY2008 fleet for each
vehicle class. [Sec. 10]

Requires establishment of a
tire fuel efficiency
consumer information
program.
[Sec. 2]
Requires establishment of a
fuel conservation education
program.
[Sec.3]
Extends credit for
production of alternativefueled automobiles. [Sec. 4]

Other Key Non-

No provision.

This is a broad bill that also

This is a broad bill that also

No provision.

No provision.

CRS-17
H.R. 656 (Reichert)
CAFE Provisions

H.R. 1133 (Berkley)

H.R. 1500 (DeFazio)

includes provisions relating
to nuclear energy, offshore
leases, repeal of certain tax
subsidies and extension of
certain tax credits,
renewable portfolio
standard, and other matters.

includes provisions on
several matters such as
petroleum industry
concentration, the Strategic
Petroleum Reserve,
minimum inventory levels.

H.R. 1506 (Markey)

H.R. 2927
(Hill)

Table 3. Comparison of Bills To Establish Automobile Greenhouse Gas Standards in the 110th Congress
S. 309 (Sanders)

S. 485 (Kerry)

Bill Title

Global Warming Pollution Reduction Act

Global Warming Reduction Act of 2007

Greenhouse Gas
(GHG) Emission
Standard

The Environmental Protection Agency (EPA) Administrator is required
to establish regulations starting in MY2016 requiring the average fleet
greenhouse gas emissions be less than 205 grams per mile for passenger
cars and 332 grams per mile for light trucks. [Sec. 707] (This greenhouse
gas standard is roughly equivalent to an MY2016 CAFE standard of 42
mpg for passenger cars and 26 mpg for light trucks.)

The EPA Administrator is required to establish regulations for reducing
greenhouse gas emissions from passenger vehicles at least as stringent as
those adopted by the California Air Resources board on September 2324, 2004. Those regulations cap greenhouse gas emissions at 205 grams
per mile for passenger cars and 332 grams per mile for light trucks by
2016. [Sec. 704] (This is roughly equivalent to an MY2016 CAFE
standard of 42 mpg for passenger cars and 26 mpg for light trucks.)

Other Key CAFERelated Provisions

Requires greenhouse gas emissions standards for medium- and heavyduty trucks.

No provision.

Other Key NonCAFE Provisions

Caps greenhouse gas emissions on an economy-wide basis beginning in
2010. Emissions are capped at 20% of their 1990 levels in the year
2050. The EPA has the discretion to employ a market-based allowance
trading program or any combination of cost-effective emission reduction
strategies. The bill also includes mandatory greenhouse gas emission
standards for new powerplants, along with a new energy efficiency
performance standard. The bill would establish a renewable portfolio

Caps greenhouse gas emissions on an economy-wide basis beginning in
2010. Emissions are capped at 38% of their 1990 levels in 2050. The
allowance trading system includes an allocation scheme that requires an
unspecified percentage of allowances to be auctioned. The bill also
includes a new energy efficiency performance standard. The bill would
establish a renewable portfolio standard (RPS), increase biofuel
mandates under the Renewable Fuels Standard, and mandate new

CRS-18
S. 309 (Sanders)
standard (RPS) and a new low-carbon generation requirement and
trading program.

S. 485 (Kerry)
infrastructure for biofuels. Finally, the bill expands and extends existing
tax incentives for alternative fuels and advanced technology vehicles,
and establishes a manufacturer tax credit for advanced technology
vehicle investment.

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Source: Frix Law Library, https://www.frixlaw.com/law-library/documents/crs%3ARL33982. Public record. Not legal advice.
