Appendix A - 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
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 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
(ft 2)
Volume Fuel economy target standard
(mpg)
Group Carline name Basic
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 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).