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:
| 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. |
| 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).