CFR›Title 49›Subtitle B›Chapter V›Part 531 ContainsSections 531.1–531.6; Appendix ACorpusDaily eCFRDisplayed edition2026-10-05Last updated2026-10-05 PART 531—PASSENGER AUTOMOBILE AVERAGE FUEL ECONOMY STANDARDSLink to an amendment published at 91 FR 62277, Sept. 30, 2026. Contents 531.1 § 531.1 Scope. 531.2 § 531.2 Purpose. 531.3 § 531.3 Applicability. 531.4 § 531.4 Definitions. 531.5 § 531.5 Fuel economy standards. 531.6 § 531.6 Measurement and calculation procedures. Appendix A to Part 531 Appendix A to Part 531—Example of Calculating Compliance Under § 531.5(c) Authority49 U.S.C. 32902, delegation of authority at 49 CFR 1.95.Source87 FR 26070, May 2, 2022, unless otherwise noted.
PART 531—PASSENGER AUTOMOBILE AVERAGE FUEL ECONOMY STANDARDSLink to an amendment published at 91 FR 62277, Sept. 30, 2026.