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Manufacturers of diesel engines make it clear that small amounts of biodiesel are usually fine (most say B5, or diesel with five percent biodiesel mixed in, is OK), but they won't make any promises about higher concentrations. Popular Mechanics has a good article that explains that these companies aren't just trying to make life difficult for plant-fuel lovers: there's technology in new diesel cars that doesn't play nice with biodiesel. The Environment Protection Agency and the California Air Re

Back in October, an L-29 military aircraft named BioJet I powered by nothing but B100 biodiesel made a successful flight over Reno, Nevada. That short jaunt has now set the stage for something bigger: the first round-the-world flight powered by biodiesel. The pilot behind this undertaking is Doug Rodante, and he's assembled a team called Green-Flight International to help him use the cheaper and more environmentally-friendly biofuel in his quest. The team is currently working on an FAA fuel test