Typically, traditionally, a turbo setup better allows you to keep some of your mpgs as you can 'nurse' the engine to not make as much boost. That being said, there's still the facts of exhaust restriction and (hopefully) larger or higher flow injectors, so... The other factor to consider in both SC and TC is that the engine will make more power at a lower RPM, meaning that you won't need to down shift as much, which helps mileage a bit. wither way, if you're looking at mpgs, FI might not be your thing.
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