In this subchapter, a vehicle is considered to be using compressed natural gas, liquefied natural gas, liquefied petroleum gas, methanol or methanol/gasoline blends of 85 percent or greater, ethanol or ethanol/gasoline blends of 85 percent or greater, biodiesel or biodiesel/diesel blends of 20 percent or greater, or electricity, including electricity to power a plug-in hybrid motor vehicle, if the vehicle uses those fuels:
(1) not less than 80 percent of the time the vehicle is driven; and
(2) either in its original equipment engine or in an engine that has been converted to use those fuels.