Toyota is way ahead in developing hybrids―gas/electric combos―for the retail market. It has sold more than 50,000 of its Prius car to Americans, has just put a much improved Prius on sale and has two more hybrid models coming next year. Honda is selling them, too. Ford, General Motors and others are working on hybrids. What we don't know is if they make sense financially. Will having two engines save enough in fuel to make the car worth its extra cost? Even if fuel savings are all that important, there's the question of whether hybrids are better or more efficient than a diesel engine, common in European cars.
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