Imagine a car that gets 82 miles a gallon -- doubling the average fuel efficiency of the green-automotive market leader Toyota Prius. French auto maker PSA Peugeot-Citroen believes it can deliver such a car by 2010 with hybrid diesel engines that will join two fuel-efficient technologies. "That's the future. It combines the best of both worlds," says Thomas Sedran, partner at Munich consultancy Roland Berger.
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