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Photos: Fuels of the future

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• FAQ: Guide to alternative fuels

February 1, 2007 3:58 AM PST

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Ethanol cars, like the coming Obvio from Zap, can run on a mix of fuel that's mostly vegetable alcohol. Ethanol produces fewer tailpipe emissions, and the performance of these cars ranks with gas burning cars, but economic clouds hang over corn and soy ethanol.

Photo by Michael Kanellos/CNET News.com

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