§ 474.3 Petroleum-equivalent fuel economy calculation.
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
(a) The petroleum-equivalent fuel economy for an electric vehicle is calculated as follows:
(1) Determine the electric vehicle's Urban Dynamometer Driving Schedule energy consumption value and the Highway Fuel Economy Driving Schedule energy consumption value in units of Watt-hours per mile;
(2) Determine the combined energy consumption value by averaging the Urban Dynamometer Driving Schedule energy consumption value and the Highway Fuel Economy Driving Schedule energy consumption value using a weighting of 55 percent urban/45 percent highway; and
(3) Calculate the petroleum-equivalent fuel economy by dividing the appropriate petroleum-equivalency factor (depending on whether any petroleum-powered accessories are installed; see paragraph (b) of this section) by the combined energy consumption value, and round to the nearest 0.01 miles per gallon.
(b) The petroleum-equivalency factors for electric vehicles are as follows:
(1) If the electric vehicle does not have any petroleum-powered accessories installed, the value of the petroleum equivalency factor is 12,307 Watt-hours per gallon.
(2) If the electric vehicle has any petroleum-powered accessories installed, the value of the petroleum-equivalency factor is 11,706 Watt-hours per gallon.
[65 FR 36991, June 12, 2000, as amended at 89 FR 22059, Mar. 29, 2024; 91 FR 554, Jan. 8, 2026; 91 FR 7817, Feb. 19, 2026]
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