49 CFR Part 531, Appendix A to Part 531 - Example of Calculating Compliance Under

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View PDF at GPO Pt. 531, App. 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 1
Model type Description Actualmeasured 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 Appendix A, Table 1.
Manufacturer X's required corporate average fuel economy level standard under § 531.5(c) 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 2:
Appendix A, Table 2
Manufacturer X calculates a fuel economy target standard for each unique model type and footprint combination.
Model type Description Base tire size Wheelbase(inches) Track width F&Raverage (inches) Footprint(ft2) Volume Fuel economy target standard(mpg)
Group Carline name Basicengine (L) Transmission class
1a PC A FWD 1.8 A5 2-door sedan 205/75R14 99.8 61.2 42.4 900 35.01
1b PC A FWD 1.8 A5 2-door sedan 215/70R15 99.8 60.9 42.2 600 35.14
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
6a PC B RWD 2.5 A6 4-door wagon 235/65R16 109.2 67.2 51.0 4,000 30.19
6b PC B RWD 2.5 A6 4-door wagon 265/55R18 109.2 66.8 50.7 4,000 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 Appendix A, Table 2.
With the appropriate fuel economy targets determined for each unique model type and footprint combination, Manufacturer X's required fuel economy target standard would be calculated as illustrated in Appendix A, Figure 1.
Note to Appendix A, Figure 2.
Since the actual average fuel economy of Manufacturer X's fleet is 32.0 mpg, as compared to its required fuel economy level of 31.8 mpg, Manufacturer X complied with the CAFE standard for MY 2012 as set forth in § 531.5(c).
[75 FR 25719, May 7, 2010]

Title 49 published on 2013-10-01

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