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49 CFR Appendix A to Part 531: Appendix A to Part 531—Example of Calculating Compliance Under § 531.5(c)

Assume a hypothetical manufacturer (Manufacturer X) produces a fleet of domestic passenger automobiles in MY 2012 as follows:
Appendix A—Table I
Model type Description Actual measured fuel economy (mpg) Volume
Group Carline name Basic engine (L) Transmission class
1 PC A FWD 1.8 A5 2-door sedan 34.0 1,500
2 PC A FWD 1.8 M6 2-door sedan 34.6 2,000
3 PC A FWD 2.5 A6 4-door wagon 33.8 2,000
4 PC A AWD 1.8 A6 4-door wagon 34.4 1,000
5 PC A AWD 2.5 M6 2-door hatchback 32.9 3,000
6 PC B RWD 2.5 A6 4-door wagon 32.2 8,000
7 PC B RWD 2.5 A7 4-door sedan 33.1 2,000
8 PC C AWD 3.2 A7 4-door sedan 30.6 5,000
9 PC C FWD 3.2 M6 2-door coupe 28.5 3,000
Total 27,500
Note to Table I to this appendix: Manufacturer X's required fleet average fuel economy standard level would first be calculated by determining the fuel economy targets applicable to each unique model type and footprint combination for model type groups 1-9 as illustrated in Table II to this appendix.
Manufacturer X calculates a fuel economy target standard for each unique model type and footprint combination.
Appendix A—Table II
Model type Description Base tire size Wheelbase (inches) Track width F&R average (inches) Footprint (ft2) Volume Fuel economy target standard (mpg)
Group Carline name Basic engine (L) Transmission class
1 PC A FWD 1.8 A5 2-door sedan 205/75R14 99.8 61.2 42.4 1,500 35.01
2 PC A FWD 1.8 M6 2-door sedan 215/70R15 99.8 60.9 42.2 2,000 35.14
3 PC A FWD 2.5 A6 4-door wagon 215/70R15 100.0 60.9 42.3 2,000 35.08
4 PC A AWD 1.8 A6 4-door wagon 235/60R15 100.0 61.2 42.5 1,000 35.95
5 PC A AWD 2.5 M6 2-door hatchback 225/65R16 99.6 59.5 41.2 3,000 35.81
6 PC B RWD 2.5 A6 4-door wagon 265/55R18 109.2 66.8 50.7 8,000 30.33
7 PC B RWD 2.5 A7 4-door sedan 235/65R17 109.2 67.8 51.4 2,000 29.99
8 PC C AWD 3.2 A7 4-door sedan 265/55R18 111.3 67.8 52.4 5,000 29.52
9 PC C FWD 3.2 M6 2-door coupe 225/65R16 111.3 67.2 51.9 3,000 29.76
Total 27,500
Note to Table II to this appendix: With the appropriate fuel economy targets determined for each unique model type and footprint combination, Manufacturer X's required fleet average fuel economy standard would be calculated as illustrated in Figure 1 to this appendix.
Note to Figure 2 to this appendix:
Since the actual fleet average fuel economy performance of Manufacturer X's fleet is 32.0 mpg, as compared to its required fleet fuel economy standard of 31.6 mpg, Manufacturer X complied with the CAFE standard for MY 2012 as set forth in § 531.5(c).

Where this section sits in the code

Title 49—Transportation
Subtitle B—Other Regulations Relating to Transportation
CHAPTER V—NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
PART 531—PASSENGER AUTOMOBILE AVERAGE FUEL ECONOMY STANDARDS

Assume a hypothetical manufacturer (Manufacturer X) produces a fleet of domestic passenger automobiles in MY 2012 as follows:

Appendix A—Table I

Model type Description Actual measured fuel economy (mpg) Volume

Group Carline name Basic engine (L) Transmission class

1 PC A FWD 1.8 A5 2-door sedan 34.0 1,500

2 PC A FWD 1.8 M6 2-door sedan 34.6 2,000

3 PC A FWD 2.5 A6 4-door wagon 33.8 2,000

4 PC A AWD 1.8 A6 4-door wagon 34.4 1,000

5 PC A AWD 2.5 M6 2-door hatchback 32.9 3,000

6 PC B RWD 2.5 A6 4-door wagon 32.2 8,000

7 PC B RWD 2.5 A7 4-door sedan 33.1 2,000

8 PC C AWD 3.2 A7 4-door sedan 30.6 5,000

9 PC C FWD 3.2 M6 2-door coupe 28.5 3,000

Total 27,500

Note to Table I to this appendix: Manufacturer X's required fleet average fuel economy standard level would first be calculated by determining the fuel economy targets applicable to each unique model type and footprint combination for model type groups 1-9 as illustrated in Table II to this appendix.

Manufacturer X calculates a fuel economy target standard for each unique model type and footprint combination.

Appendix A—Table II

Model type Description Base tire size Wheelbase (inches) Track width F&R average (inches) Footprint (ft2) Volume Fuel economy target standard (mpg)

Group Carline name Basic engine (L) Transmission class

1 PC A FWD 1.8 A5 2-door sedan 205/75R14 99.8 61.2 42.4 1,500 35.01

2 PC A FWD 1.8 M6 2-door sedan 215/70R15 99.8 60.9 42.2 2,000 35.14

3 PC A FWD 2.5 A6 4-door wagon 215/70R15 100.0 60.9 42.3 2,000 35.08

4 PC A AWD 1.8 A6 4-door wagon 235/60R15 100.0 61.2 42.5 1,000 35.95

5 PC A AWD 2.5 M6 2-door hatchback 225/65R16 99.6 59.5 41.2 3,000 35.81

6 PC B RWD 2.5 A6 4-door wagon 265/55R18 109.2 66.8 50.7 8,000 30.33

7 PC B RWD 2.5 A7 4-door sedan 235/65R17 109.2 67.8 51.4 2,000 29.99

8 PC C AWD 3.2 A7 4-door sedan 265/55R18 111.3 67.8 52.4 5,000 29.52

9 PC C FWD 3.2 M6 2-door coupe 225/65R16 111.3 67.2 51.9 3,000 29.76

Total 27,500

Note to Table II to this appendix: With the appropriate fuel economy targets determined for each unique model type and footprint combination, Manufacturer X's required fleet average fuel economy standard would be calculated as illustrated in Figure 1 to this appendix.

Note to Figure 2 to this appendix:

Since the actual fleet average fuel economy performance of Manufacturer X's fleet is 32.0 mpg, as compared to its required fleet fuel economy standard of 31.6 mpg, Manufacturer X complied with the CAFE standard for MY 2012 as set forth in § 531.5(c).

Collected 2026-08-27T02:26:34Z. Source file · JSON

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