10 CFR § 474.2 - Definitions.

---
identifier: "/us/cfr/t10/s474.2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 474.2 - Definitions."
title_number: 10
title_name: "Energy"
section_number: "474.2"
section_name: "Definitions."
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"
---


# 474.2 Definitions.

For the purposes of this part, the term:

*Combined energy consumption value* means the weighted average of the Urban Dynamometer Driving Schedule and the Highway Fuel Economy Driving Schedule energy consumption values (weighted 55/45 percent, respectively), as determined by the Environmental Protection Agency in accordance with 40 CFR parts 86 and 600.

*Electric vehicle* means a vehicle that is powered by an electric motor drawing current from rechargeable storage batteries or other portable electrical energy storage devices, provided that:

(1) Recharge energy must be drawn from a source off the vehicle, such as residential electric service; and

(2) The vehicle must comply with all provisions of the Zero Emission Vehicle definition found in 40 CFR 88.104-94(g).

*Highway Fuel Economy Driving Schedule energy consumption value* means the average number of watt-hours of electrical energy required for an electric vehicle to travel one mile of the Highway Fuel Economy Driving Schedule, as determined by the Environmental Protection Agency.

*Petroleum equivalency factor* means the value specified in § 474.3(b) of this part, which incorporates the parameters listed in 49 U.S.C. 32904(a)(2)(B) and is used to calculate petroleum-equivalent fuel economy.

*Petroleum-equivalent fuel economy* means the value, expressed in miles per gallon, that is calculated for an electric vehicle in accordance with § 474.3(a) of this part, and reported to the Administrator of the Environmental Protection Agency for use in determining the vehicle manufacturer's corporate average fuel economy.

*Petroleum-powered accessory* means a vehicle accessory (e.g., a cabin heater, defroster, and/or air conditioner) that:

(1) Uses gasoline or diesel fuel as its primary energy source; and

(2) Meets the requirements for fuel, operation, and emissions in 40 CFR part 88.104-94(g).

*Urban Dynamometer Driving Schedule energy consumption value* means the average number of Watt-hours of electrical energy required for an electric vehicle to travel one mile of the Urban Dynamometer Driving Schedule, as determined by the Environmental Protection Agency.

[65 FR 36991, June 12, 2000, as amended at 89 FR 22059, Mar. 29, 2024; 91 FR 554, Jan. 8, 2025]