The Green Local 175, an environmental group in Utica, N.Y., organized the first Freedom Riders for Energy Independence car exhibition to promote the use of alternative-fuel vehicles. Among the vehicles showcased at the car show was a propane autogas-powered bus. "It runs on propane, strictly propane. It's not one of those engines that runs between diesel and propane, so it actually has zero emissions," said Jeremy Johnston of New York Bus Sales.

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