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sideblinder.... now that is some useful information. I knew that gas engines restricted air intake during low load situations. I wonder how much fuel that wastes and at what point you overcome it. I guess that's why those BFSC look so odd. A diesel engine is much different. It doesn't waste fuel until you can't cram enough air in to burn what in there. With diesel you could go with what is considered a horribly undersized engine and still get good fuel efficiency, as long as you can do most of you driving in the optimum Fuel to horsepower rpm. This fact is actually what trips a lot of people up when it comes to diesel, they think that a smaller engine will get better fuel efficiency. which is not the necessarily the case, engine design is the biggest factor determining engine efficiency in a diesel car. I guess any kinda of list showing the relative efficiency of different engines would only work with diesels, as there are to many variables when it comes to gas engines.
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