A flexible-fuel vehicle (FFV) or dual-fuel vehicle (also sometimes called only flex-fuel) is an
automobile that can typically use different sources of
fuel, either mixed in the same tank or with separate tanks and fuel systems for each fuel. A common example is a vehicle that can accept
gasoline mixed with varying levels of
bioethanol (
gasohol). Some cars carry a
natural gas tank and one can switch from gasoline to gas.
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