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Diesel engines? Diesel engines exists for a long time now. And the price of diesel is close to that of gasoline. Are you pertaining to hybrid engines? Engines that may run on ethanol or hydrogen and other resource?
Well those engines are great but I don't think that it will be in use or popular for another few years. Well the resources for those are not available like gasoline and diesel. Not all pump stations supply those sort of alternatives.
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