Everyone and their CEO is hoping to come out with the next great fuel conserving vehicle. Funny ain't it? Audi's latest attempt is the A2-H2, a fuel-cell vehicle based on the already fuel efficient A2. The H2 version gets the equivalent of 94 mpg on three hydrogen storage tanks. Unfortunately that still only means a range of 137 miles before refueling. But the little car that emits water vapor only gets up to 62 mph in less than 10 seconds and has a top speed of 109 mph. Not bad for a fuel-cell car.

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