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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 49
Chapter V
Part 531 - PART 531—PASSENGER AUTOMOBILE AVERAGE FUEL ECONOMY STANDARDS
§ 531.1 - Scope.
§ 531.2 - Purpose.
§ 531.3 - Applicability.
§ 531.4 - Definitions.
§ 531.5 - Fuel economy standards.
§ 531.6 - Measurement and calculation procedures.
Appendix Appendix A - Appendix A to Part 531—Example of Calculating Compliance Under § 531.5(c)
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