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

Title 49Subtitle BChapter VPart 531 → Appendix


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


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 typeDescriptionActual measured fuel economy
(mpg)
Volume
GroupCarline nameBasic
engine
(L)
Transmission class
1PC A FWD1.8A52-door sedan34.01,500
2PC A FWD1.8M62-door sedan34.62,000
3PC A FWD2.5A64-door wagon33.82,000
4PC A AWD1.8A64-door wagon34.41,000
5PC A AWD2.5M62-door hatchback32.93,000
6PC B RWD2.5A64-door wagon32.28,000
7PC B RWD2.5A74-door sedan33.12,000
8PC C AWD3.2A74-door sedan30.65,000
9PC C FWD3.2M62-door coupe28.53,000
Total27,500

Note to Appendix A Table I: 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 Appendix A Table II:

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

Appendix A Table II

Model typeDescriptionBase tire sizeWheelbase
(inches)
Track width F&R average
(inches)
Footprint
(ft2)
VolumeFuel economy target standard
(mpg)
GroupCarline nameBasic
engine
(L)
Transmission class
1PC A FWD1.8A52-door sedan205/75R1499.861.242.41,50035.01
2PC A FWD1.8M62-door sedan215/70R1599.860.942.22,00035.14
3PC A FWD2.5A64-door wagon215/70R15100.060.942.32,00035.08
4PC A AWD1.8A64-door wagon235/60R15100.061.242.51,00035.95
5PC A AWD2.5M62-door hatchback225/65R1699.659.541.23,00035.81
6PC B RWD2.5A64-door wagon265/55R18109.266.850.78,00030.33
7PC B RWD2.5A74-door sedan235/65R17109.267.851.42,00029.99
8PC C AWD3.2A74-door sedan265/55R18111.367.852.45,00029.52
9PC C FWD3.2M62-door coupe225/65R16111.367.251.93,00029.76
Total27,500

Note to Appendix A Table II: 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 Appendix A Figure 1:

Appendix A Figure 1—Calculation of Manufacturer X's fleet average fuel economy standard using Table II:

Fleet average fuel economy standard =

eCFR graphic er15oc12.074.gif

View or download PDF

= 31.6 mpg

Appendix A Figure 2—Calculation of Manufacturer X's actual fleet average fuel economy performance level using Table I:

Fleet average fuel economy performance =

eCFR graphic er15oc12.075.gif

View or download PDF

= 32.0 mpg

Note to Appendix A Figure 2: 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).

[77 FR 63191, Oct. 15, 2012, as amended at 84 FR 51362, Sept. 27, 2019]

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