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Multi-fuel capable cars have been around for quite some time. Case in point, five years ago we reported on a Volvo prototype that could burn five different types of fuel. But a new project from Chrysler is aiming to do something that none of these existing flex-fuel vehicles can pull off: an engine that burns both gasoline and diesel at the same time.

Volvo announced last week a prototype flexible fuel engine that can burn five different types of fuel: E85, methane (made from either natural gas or plant sources, so Volvo is counting this as two fuels), regular petrol gasoline or hythane, (which is 10 percent hydrogen and 90 percent methane). The vehicle, called the Multi-Fuel, was unveiled at the Michelin Challenge Bibendum, the "international sustainable mobility event".