Ford has expanded its lineup of flexible-fuel vehicles, alternative fuel vehicles, and dual-fuel vehicles. Flexible fuel vehicles can operate on a range of fuel mixtures – such as ethanol-gasoline blends ranging from pure gasoline to E85 (85% ethanol, 15% gasoline). Alternative fuel vehicles operate on non-petroleum fuels, such as methanol, compressed natural gas (CNG), propane, and hydrogen. Dual fuel vehicles generally have two fuel tanks – one for compressed natural gas or propane, and another for regular gasoline – with a selector switch to choose between them. Vehicles using these fueling alternatives are currently in test fleets, for Example as taxis and shuttle buses, and some are or will soon be available for sale to the public. Ford is now committed to sell 250,000 alternative and flexible fuel vehicles – the majority of which will be designed to operate on ethanol-gasoline blends such as E85 – in 2006.