Federal · Final rule · Energy Department
Petroleum-Equivalent Fuel Economy Calculation
Final rule Significant Official data
Last official action: · Record last updated:
Official abstract (Federal Register)
The U.S. Department of Energy (DOE) is amending its regulations in compliance with a United States Court of Appeals for the Eighth Circuit court decision vacating the March 29, 2024 rule revising procedures for calculating a value for the petroleum-equivalent fuel economy of electric vehicles (EVs) used by the Environmental Protection Agency (EPA) in calculating light-duty vehicle manufacturers' compliance with the Department of Transportation's (DOT) Corporate Average Fuel Economy (CAFE) standards.
Dates (as published)
This action is effective on January 8, 2026. However, the opinion had legal effect on September 5, 2025.
Read the rule on FederalRegister.gov ↗