equivalent fleet average under finalized 2024 CAFE rule
1975 ORIGINAL STANDARD
18 MPG
passenger car mandate when CAFE was enacted
RULE FINALIZED
April 19, 2024
NHTSA issued Biden-era MY2027–2031 final rule
LAW ON THE BOOKS
1975
Energy Policy and Conservation Act, origin of CAFE authority
Questions & Answers
MPG figures represent NHTSA-required minimums, not actual fleet performance. Projected values (2026–2031) are estimates based on published trajectories and reported rollback scope as of publication. Fuel savings estimates follow NHTSA Regulatory Impact Analysis methodology: 15,000 mi/yr, 15-year life, $3.50/gal. MPGe values for later model years reflect NHTSA accounting methodology crediting electric-vehicle efficiency.