---
kind: "section"
citation: "10 C.F.R. § 474.3"
title: "10"
number: "474.3"
heading: "Petroleum-equivalent fuel economy calculation."
url: "https://uscodex.org/cfr/10/474.3"
---

# §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)](#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.

## Notes

### 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]