Typically whenever I have seen a motorcycle engine dropped into a car chassis they get worse mileage than before(either when more engine volume is added or when its less). That said they are usually lighter than car engines but a little bit of weight savings at the cost of engine efficiency is not a good trade. If you are aiming for more power thats a good thing because typically bike engines produce more power, at the cost of efficiency, but still gain in weight reduction.
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