aIncludes 85% ethanol (E85) and 95% ethanol (E95). E85 includes only fleet-based vehicles and excludes vehicles with E85 fueling capability that are owned by individuals. bIncludes compressed natural gas (CNG) and liquified natural gas (LNG). cExcludes gasoline-electric hybrids. dIncludes 85% methanol (M85), neat methanol (M100), and hydrogen fuels.
Key: LPG = liquefied petroleum gas.
Source: U.S. Department of Energy, Energy Information Administration, available at www.afdc.energy.gov/data as of September 2013.