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Depends entirely on how you use it.
One of the challenges with a combustion engine is to make sure that it's actually combusting every bit of fuel that it has sucked in, which it might not always do. Often there's a bit of unburnt fuel vented out with the exhaust gasses.
Supercharging can, by providing better conditions for combustion (higher pressures/temperatures), make the engine able to burn a higher percentage of the ingested fuel, making it more fuel efficent.
The bigger the combustion chamber, the harder it becomes to get all the fuel burnt. By using a supercharger on a smaller engine you can get the smaller engine to make as much horsepower as a bigger engine - but at a cleaner burn. Again, resulting in better fuel efficiency.
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