[Code of Federal Regulations] [Title 10, Volume 3] [Revised as of January 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 10CFR490.306] [Page 524] TITLE 10--ENERGY CHAPTER II--DEPARTMENT OF ENERGY PART 490_ALTERNATIVE FUEL TRANSPORTATION PROGRAM--Table of Contents Subpart D_Alternative Fuel Provider Vehicle Acquisition Mandate Sec. 490.306 Vehicle operation requirements. The alternative fueled vehicles acquired pursuant to section 490.302 of this part shall be operated solely on alternative fuels, except when these vehicles are operating in an area where the appropriate alternative fuel is unavailable.