In this title the following words have the meanings indicated. “Aviation fuel” means: aviation gasoline; or turbine fuel. “Aviation gasoline” means gasoline that is used to propel gasoline–powered aircraft and: is invoiced as aviation gasoline; or is received, sold, stored, or withdrawn from storage by a person for the purpose of propelling gasoline–powered aircraft. “Aviation gasoline” does not include gasoline used to propel a motor vehicle. “Clean-burning fuel” means, when used for motor vehicle propulsion: natural gas; liquefied natural gas; liquefied petroleum gas; hydrogen; electricity; or any other fuel at least 85% of which is one or more of the following: methanol; ethanol; any other alcohol; or ether. “Gasoline” means a product that: is used as fuel in a spark ignited, internal combustion engine; or is designated as gasoline by the Comptroller. “Gasoline” includes: casinghead gasoline; absorption gasoline; other natural gasoline; and aviation gasoline. “Motor fuel” means: gasoline; or special fuel. “Motor vehicle” means a vehicle that: is self-propelled; is designed to be operated on a public highway; and is not operated only on rails. “Special fuel” means a product that is usable as fuel in an internal combustion engine. “Special fuel” includes clean-burning fuel except electricity. “Special fuel” does not include gasoline. “Turbine fuel” means Jet A, A-1, or B fuel that is used to propel turbine powered aircraft.