Probably not what you're looking for, but there is a company in Michigan that makes swap kits for the Honda K20 200 hp engines. The designers say that it has so much more power than it needs that their ECU tuning lets it spend a long time in lean burn. I would personally REALLY like to own a 48 mpg (their #) car that has the power to weight ratio of a Corvette. Still, Honda drivetrains are pretty modular. You could put a lower flowing head on it, higher gears, or just stay out of VTEC (good luck with that) for better results.
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