US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter V — NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATIONPart 525 — EXEMPTIONS FROM AVERAGE FUEL ECONOMY STANDARDS525.949 C.F.R. § 525.9Duration of exemption.Last amended: 2016Year: 2026Length: 15 wordsOfficial source Cite as 49 C.F.R. § 525.9 (2026)An exemption may be granted under this part for not more than three model years.Previous49 C.F.R. § 525.8Next49 C.F.R. § 525.10