10 CFR § 474.3 - Petroleum-equivalent fuel economy calculation.

---
identifier: "/us/cfr/t10/s474.3"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 474.3 - Petroleum-equivalent fuel economy calculation."
title_number: 10
title_name: "Energy"
section_number: "474.3"
section_name: "Petroleum-equivalent fuel economy calculation."
chapter_name: "DEPARTMENT OF ENERGY"
subchapter_number: "D"
subchapter_name: "ENERGY CONSERVATION"
part_number: "474"
part_name: "ELECTRIC AND HYBRID VEHICLE RESEARCH, DEVELOPMENT, AND DEMONSTRATION PROGRAM; PETROLEUM-EQUIVALENT FUEL ECONOMY CALCULATION"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 32901"
regulatory_source: "65 FR 36991, June 12, 2000, unless otherwise noted."
cfr_part: "474"
---


# 474.3 Petroleum-equivalent fuel economy calculation.

(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]