49 CFR § 531.3 Passenger Automobile Average Fuel Economy Standards§ 531.3 Applicability.Current through Sep 25, 2026 · Read all of Part 531⚠ 1 pending change to Part 531The Safer Affordable Fuel-Efficient (SAFE) Vehicles Rule III for Model Years 2022 to 2031 Passenger Cars and Light TrucksRule · takes effect Nov 30, 2026 · Transportation DepartmentThis part applies to manufacturers of passenger automobiles.