[Code of Federal Regulations] [Title 49, Volume 5] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR525.9] [Page 89] TITLE 49--TRANSPORTATION OF TRANSPORTATION PART 525--EXEMPTIONS FROM AVERAGE FUEL ECONOMY STANDARDS--Table of Contents Sec. 525.9 Duration of exemption. An exemption may be granted under this part for not more than three model years.