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This is a very interesting story and something I never considered. I think this interpretation is absolutely correct: that, unless they expand capacity, adding a diesel would not add a single additional unit of sales. I do wonder though whether the premium being charged by GM for their diesel is going to translate into additional profit as their dealership network already is set up for diesel service. I for one would most likely not be buying one of the GM twins if not for the fact that a diesel was coming. Here in Canada diesel is cheaper per litre than gasoline, is available at most major stations, and is obviously a great fuel for a truck.