Appendix II to Part 600 - Sample Fuel Economy Calculations
40:32.0.1.4.44.6.13.9.34 : Appendix II
Appendix II to Part 600 - Sample Fuel Economy Calculations
(a) This sample fuel economy calculation is applicable to 1978
through 1987 model year automobiles.
(1) Assume that a gasoline-fueled vehicle was tested by the
Federal Emission Test Procedure and the following results were
calculated:
HC = .139 grams/mile CO = 1.59 grams/mile CO2 = 317 grams/mile
According to the procedure in § 600.113-78, the city fuel
economy or MPGc, for the vehicle may be calculated by substituting
the HC, CO, and CO2 grams/mile values into the following
equation.
MPGc = 27.7
(2) Assume that the same vehicle was tested by the Federal
Highway Fuel Economy Test Procedure and calculation similar to that
shown in paragraph (a) by this appendix resulted in a highway fuel
economy or MPGh of 36.9. According to the procedure in § 600.113,
the combined fuel economy (called MPGc/h) for the vehicle may be
calculated by substituting the city and highway fuel economy values
into the following equation:
(b) This sample fuel economy calculation is applicable to 1988
and later model year automobiles.
(1) Assume that a gasoline-fueled vehicle was tested by the
Federal Emission Test Procedure and the following results were
calculated:
HC = .139 grams/mile. CO = 1.59 grams/mile. CO2 = 317 grams/mile.
(2) Assume that the test fuel used for this test had the
following properties:
SG = 0.745. CWF = 0.868. NHV = 18,478 Btu/lb.
(3) According to the procedure in § 600.113-08, the city fuel
economy or MPGc, for the vehicle may be calculated by substituting
the HC, CO, and CO2 gram/mile values and the SG, CWF, and NHV
values into the following equation:
MPGc = (5174 × 10 4 × CWF × SG) / [((CWF × HC) + (0.429 × CO +
(0.273 × CO2)) ((0.6 × SG × NHV) + 5471)]
Example:
MPGc = (5174 × 10 4 × 0.868 × 0.745) / [(0.868 × .139 + 0.429 ×
1.59 + 0.273 × 317)(0.6 × 0.745 × 18478 + 5471)] MPGc = 27.9
(4) Assume that the same vehicle was tested by the Federal
Highway Fuel Economy Test Procedure and a calculation similar to
that shown in (b)(3) of this section resulted in a highway fuel
economy of MPGh of 36.9. According to the procedure in §
600.210-08(c) or § 600.210-12(c), the combined fuel economy (called
MPGcomb) for the vehicle may be calculated by substituting the city
and highway fuel economy values into the following equation:
[51 FR
37852, Oct. 24, 1986, as amended at 71 FR 77958, Dec. 27, 2006; 76
FR 39570, July 6, 2011]