When an average fuel economy standard prescribed under this chapter is in effect, a State or a political subdivision of a State may not adopt or enforce a law or regulation related to fuel economy standards or average fuel economy standards for automobiles covered by an average fuel economy standard under this chapter.
When a requirement under section 32908 of this title is in effect, a State or a political subdivision of a State may adopt or enforce a law or regulation on disclosure of fuel economy or fuel operating costs for an automobile covered by section 32908 only if the law or regulation is identical to that requirement.
A State or a political subdivision of a State may prescribe requirements for fuel economy for automobiles obtained for its own use.
(Pub. L. 103–272, § 1(e), July 5, 1994, 108 Stat. 1075, § 32918; renumbered § 32919, Pub. L. 103–429, § 6(43)(A), Oct. 31, 1994, 108 Stat. 4382.)