U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 49Chapter VPart 531 - PART 531—PASSENGER AUTOMOBILE AVERAGE FUEL ECONOMY STANDARDS
View all text of Part 531 [§ 531.1 - § 531.6]
§ 531.3 - Applicability.

This part applies to manufacturers of passenger automobiles.

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