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Biodiesel Fuel
Most diesel engines can run on pure biodiesel with no significant modifications, and with little effect on the engine's performance. The fuel is catching on among those concerned about greenhouse gasses, but can cost more per gallon than petrodiesel. It is harder to store in cold climates. Diesels squeeze more energy from each gallon than gas engines, and less energy is lost from the tailpipe.
Production in 2004 was about 25 million gallons, tripling to more than 75 million last year. Government incentives and the growing number of new diesel vehicles should push that trend upward.
Country legend Willie Nelson helped make biodiesels cool, especially for those concerned about global warming and U.S. oil dependency.