10 C.F.R. § 490.306 Vehicle operation requirements.
Title 10 - Energy
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.
Title 10: Energy
PART 490—ALTERNATIVE FUEL TRANSPORTATION PROGRAM
Subpart D—Alternative Fuel Provider Vehicle Acquisition Mandate
§ 490.306 Vehicle operation requirements.
