(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 * 104 * CWF * SG) / [((CWF * HC) + (0.429 * CO + (0.273 * CO2)) ((0.6 * SG * NHV) + 5471)]
Example:
MPGc = (5174 * 104 * 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:
40 C.F.R. 600 app II to Part 600