a vehicle that can operate on a mixture of two fuels simultaneously
EPACT Definition: Vehicle designed to operate on a combination of an alternative fuel and a conventional fuel. This includes: a) vehicles using a mixture of gasoline or diesel and an alternative fuel in one fuel tank, commonly called flexible-fueled vehicles: and b) vehicles capable of operating either on an alternative fuel, a conventional fuel or both, simultaneously using two fuel systems commonly called bi-fuel vehicles.-CAA Definition: Vehicle with two separate fuel systems designed to run on either an alternative fuel or conventional gasoline, using only one fuel at a time.
A vehicle designed to operate on a combination of alternative fuel, such as CNG or LPG, and conventional fuel, such as gasoline or diesel. These vehicles have two separate fuel systems which inject both fuels simultaneously into the engine combustion chamber.
A vehicle designed to operate on a combination of an alternative fuel (usually natural gas) and diesel at the same time. Dual-fuel vehicles have two separate fuel systems, with diesel providing the ‘pilot ignition' for the other fuel.
A vehicle that runs on both an alternative fuel and a petroleum fuel in a fixed ratio, typically natural gas and diesel (see diagram on my page about alternative drivetrains).