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A forced induction engine is more efficient than an NA engine.
Size being equal, a forced induction engine will be able to use more fuel for the simple reason that a much bigger mass of air will be forced into the cylinders.
The fuel/air ratio will still stand at one part of fuel to every fourteen point seven parts of air.
A forced induction engine will run a lower compression ratio.
And finally, the pure petrol head will only see the real challenge of the ability of extracting the maximum power from an engine design when the design is NA.