Data / Federal rules / 2026-00154
Petroleum-Equivalent Fuel Economy Calculation
The Energy Department published this final rule in the Federal Register on January 8, 2026. It took effect on January 8, 2026.
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What the agency says
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.
Key facts
- Document number
- 2026-00154
- Type
- Final rule
- Action
- Final rule, technical amendment
- Agency
- Energy Department
- Published
- January 8, 2026
- Takes effect
- January 8, 2026
- Dates
- This action is effective on January 8, 2026. However, the opinion had legal effect on September 5, 2025.
- Docket
- EERE-2025-VT-0073
- Regulation ID (RIN)
- 1904-AG09
- Code of Federal Regulations
- 10 CFR 474
- Topics
- Electric power; Energy conservation; Fuel economy; Motor vehicles; Research
- Significant
- Yes, under Executive Order 12866
- Pages
- 3
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Everything from the Energy Department · Rules on electric power · Rules on energy conservation · Rules on fuel economy · Published in January 2026
Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.