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For a turbo that does better, fe-wise, than the N/A version: the '88 Saab 9000 turbo matches it's N/A version EPA combined, and betters it by 2MPG on the highway. Same car, same engine....one had a turbo bolted; one didn't.
It was also extremely laggy, which shows the path to success: a really big, heavy turbine wheel.
Diesel dave: you mentioned compressor/turbine combos at 50% efficiency...better tgan piston power. Then wny not delete the piston portion and go with a pure turbine engine? I was told in my flying days that a piston would handily beat a turbine in "power-specific fuel consumption": is that no longer true?
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