Weighing in at almost 2,600 kilograms, the brawny vehicle at DaimlerChrysler's suburban Detroit skunk works seems an unlikely "car of the future." The lines are distinctly late 20th century. Jump into the driver's seat and it feels like your standard sport utility vehicle (SUV). But pop the hood, and it instantly becomes clear that this is no ordinary gas-guzzler: In place of a combustion engine lies a sophisticated onboard refinery-a fuel processor system of high-pressure gas lines, compressors and chemical reactors to turn methanol into hydrogen gas.

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