Quote:
Originally Posted by MetroMPG
turbocharging's efficiency gains mostly come from downsizing the engine so that peak power demands are provided by the turbo, while light/moderate loads are handled off-boost by the otherwise smaller engine. (Similar to the approach of hybridization.)
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this is correct and where a large part of the gains come from.
another potential gain is that with an identical engine with a turbo, you can run along with a numerically lower FDR to drop cruise RPM and lower vacuum losses.