Quote:
Originally posted by Mulhollanddose
No, a turbocharger, if used will increase fuel consumption. The only higher efficiencies obtained would be horsepower and torque. If one stays off boost, the engine will consume as any other similarly displaced engine. One must take into account the bottom end when considering forced induction, as it may not be strong enough to handle the combustion.
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When the turbo is not spooled up, it is actually a restriction in the intake and less fuel has to be injected into the engine and it produces less power than a similar naturally aspirated engine of the same displacement.
When the turbo is spooled up, it is forcing air into the engine and therefore more fuel is required, making it produce more power than a similar naturally aspirated engine of the same displacement.