49 CFR Part 531, Appendix A to Part 531 - Example of Calculating Compliance Under
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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|
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|
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 2014-10-01
no entries appear in the Federal Register after this date.