Home
gpo.gov
govinfo.gov

e-CFR Navigation Aids

Browse

Simple Search

Advanced Search

 — Boolean

 — Proximity

 

Search History

Search Tips

Corrections

Latest Updates

User Info

FAQs

Agency List

Incorporation By Reference

eCFR logo

Related Resources

Electronic Code of Federal Regulations

We invite you to try out our new beta eCFR site at https://ecfr.federalregister.gov. We have made big changes to make the eCFR easier to use. Be sure to leave feedback using the Help button on the bottom right of each page!

e-CFR data is current as of September 25, 2020

Title 49Subtitle BChapter VPart 531 → §531.5


Title 49: Transportation
PART 531—PASSENGER AUTOMOBILE AVERAGE FUEL ECONOMY STANDARDS


§531.5   Fuel economy standards.

(a) Except as provided in paragraph (f) of this section, each manufacturer of passenger automobiles shall comply with the fleet average fuel economy standards in Table I, expressed in miles per gallon, in the model year specified as applicable:

eCFR graphic er30mr09.101.gif

View or download PDF

(b) For model year 2011, a manufacturer's passenger automobile fleet shall comply with the fleet average fuel economy level calculated for that model year according to Figure 1 and the appropriate values in Table II.

eCFR graphic er15oc12.070.gif

View or download PDF

Where:

N is the total number (sum) of passenger automobiles produced by a manufacturer;

Ni is the number (sum) of the ith passenger automobile model produced by the manufacturer; and

Ti is the fuel economy target of the ith model passenger automobile, which is determined according to the following formula, rounded to the nearest hundredth:

eCFR graphic er15oc12.071.gif

View or download PDF

Where:

Parameters a, b, c, and d are defined in Table II;

e = 2.718; and

x = footprint (in square feet, rounded to the nearest tenth) of the vehicle model.

Table II-Parameters for the Passenger Automobile Fuel Economy Targets

Model yearParameters
a (mpg)b (mpg)c (gal/mi/ft2)d (gal/mi)
201131.2024.0051.411.91

(c) For model years 2012-2026, a manufacturer's passenger automobile fleet shall comply with the fleet average fuel economy level calculated for that model year according to this Figure 2 and the appropriate values in this Table III.

eCFR graphic er15oc12.072.gif

View or download PDF

Where:

CAFErequired is the fleet average fuel economy standard for a given fleet (domestic passenger automobiles or import passenger automobiles);

Subscript i is a designation of multiple groups of automobiles, where each group's designation, i.e., i = 1, 2, 3, etc., represents automobiles that share a unique model type and footprint within the applicable fleet, either domestic passenger automobiles or import passenger automobiles;

Productioni is the number of passenger automobiles produced for sale in the United States within each ith designation, i.e., which share the same model type and footprint;

TARGETi is the fuel economy target in miles per gallon (mpg) applicable to the footprint of passenger automobiles within each ith designation, i.e., which share the same model type and footprint, calculated according to Figure 3 and rounded to the nearest hundredth of a mpg, i.e., 35.455 = 35.46 mpg, and the summations in the numerator and denominator are both performed over all models in the fleet in question.

eCFR graphic er15oc12.073.gif

View or download PDF

Where:

TARGET is the fuel economy target (in mpg) applicable to vehicles of a given footprint (FOOTPRINT, in square feet);

Parameters a, b,c, and d are defined in Table III; and

The MIN and MAX functions take the minimum and maximum, respectively, of the included values.

Table III—Parameters for the Passenger Automobile Fuel Economy Targets, MYs 2012-2026

Model yearParameters
a (mpg)b (mpg)c (gal/mi/ft2)d (gal/mi)
201235.9527.950.00053080.006057
201336.8028.460.00053080.005410
201437.7529.030.00053080.004725
201539.2429.900.00053080.003719
201641.0930.960.00053080.002573
201743.6132.650.00051310.001896
201845.2133.840.00049540.001811
201946.8735.070.00047830.001729
202048.7436.470.00046030.001643
202149.4837.020.0004530.00162
202250.2437.590.0004470.00159
202351.0038.160.0004400.00157
202451.7838.740.0004330.00155
202552.5739.330.0004270.00152
202653.3739.930.0004200.00150

(d) In addition to the requirements of paragraphs (b) and (c) of this section, each manufacturer shall also meet the minimum fleet standard for domestically manufactured passenger automobiles expressed in Table IV:

Table IV—Minimum Fuel Economy Standards for Domestically Manufactured Passenger Automobiles, MYs 2011-2026

Model yearMinimum
standard
201127.8
201230.7
201331.4
201432.1
201533.3
201634.7
201736.7
201838.0
201939.4
202040.9
202139.9
202240.6
202341.1
202441.8
202542.4
202643.1

(e) The following manufacturers shall comply with the standards indicated below for the specified model years:

(1) Avanti Motor Corporation.

Average Fuel Economy Standard

Model year Miles per gallon
197816.1
197914.5
198015.8
198118.2
198218.2
198316.9
198416.9
198516.9

(2) Rolls-Royce Motors, Inc.

Model yearAverage fuel economy standard (miles per gallon)
197810.7
197910.8
198011.1
198110.7
198210.6
19839.9
198410.0
198510.0
198611.0
198711.2
198811.2
198911.2
199012.7
199112.7
199213.8
199313.8
199413.8
199514.6
199614.6
199715.1
199816.3
199916.3

(3) Checker Motors Corporation.

Average Fuel Economy Standard

Model year Miles per gallon
197817.6
197916.5
198018.5
198118.3
198218.4

(4) Aston Martin Lagonda, Inc.

Average Fuel Economy Standard

Model year Miles per gallon
197911.5
198012.1
198112.2
198212.2
198311.3
198411.3
198511.4

(5) Excalibur Automobile Corporation.

Average Fuel Economy Standard

Model year Miles per gallon
197811.5
197911.5
198016.2
198117.9
198217.9
198316.6
198416.6
198516.6

(6) Lotus Cars Ltd.

Model yearAverage fuel economy standard (miles per gallon)
199424.2
199523.3

(7) Officine Alfieri Maserati, S.p.A.

Average Fuel Economy Standard

Model year Miles per gallon
197812.5
197912.5
19809.5
198417.9
198516.8

(8) Lamborghini of North America.

Average Fuel Economy Standard

Model year Miles per gallon
198313.7
198413.7

(9) LondonCoach Co., Inc.

Average Fuel Economy Standard

Model year Miles per gallon
198521.0
198621.0
198721.0

(10) Automobili Lamborghini S.p.A./Vector Aeromotive Corporation.

Model year Average fuel economy standard (miles per gallon)
199512.8
199612.6
199712.5

(11) Dutcher Motors, Inc.

Model year Average fuel economy standard (miles per gallon)
198616.0
198716.0
198816.0
199217.0
199317.0
199417.0
199517.0

(12) MedNet, Inc.

Model year Average fuel economy standard (miles per gallon)
199617.0
199717.0
199817.0

(13) Vector Aeromotive Corporation.

Model yearAverage fuel economy standard (miles per gallon)
199812.1

(14) Qvale Automotive Group Srl.

Model yearAverage fuel economy standard (miles per gallon)
200022.0
200122.0

(15) Spyker Automobielen B.V.

Average Fuel Economy Standard

Model year Miles per gallon
200618.9
200718.9

[43 FR 28204, June 29, 1978]

Editorial Note: For Federal Register citations affecting §531.5, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.

Need assistance?