§474.3. Petroleum-equivalent fuel economy calculation.
10 C.F.R. § 474.3
The petroleum-equivalent fuel economy for an electric vehicle is calculated as follows—
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;
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
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.
The petroleum-equivalency factors for electric vehicles are as follows—
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.
If the electric vehicle has any petroleum-powered accessories installed, the value of the petroleum-equivalency factor is 11,706 Watt-hours per gallon.
Notes, amendments, and revision history
Amendments
[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]
Authority
Authority: 49 U.S.C. 32901 et seq.
Source
Source: 65 FR 36991, June 12, 2000, unless otherwise noted.
Amendments
[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]