The Fiat Siena Tetrafuel can run on gasoline, ethanol, blends of gasoline and ethanol, and also natural gas. Photo: Fiat Brazil
Lots of people are working on developing the best new fuel to power automobiles. At IEEE Spectrum one writer asks, why not design cars that can run on whatever fuel happens to be available at the moment. In Brazil, the magazine says, Fiat has already created its Siena Tetrafuel, which can run on pure gasoline, pure ethanol, any blend of gasoline and ethanol, or natural gas. That gives drivers the option to purchase the cheapest fuel, or use a better fuel that's only available some of the time.
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