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This has been talked about before, but more so with turbocharging since turbos actually use more of the waste heat. Superchargers steal power directly from the engine to make more power. Anyway, the conclusion has always been the main benefit of supercharging/turbocharging is the ability to now downsize your engine since it is producing more power. If you don't downsize the engine the best you can hope for is the same mileage which is highly unlikely.
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