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Re: 400 rwhp and 20+ mpg?
You can get good fuel mileage and be able to make big horsepower, you won't be able to get good fuel mileage while making big horsepower.
Small(ish) cu.in. well prepared motor + turbocharger(s) + EFI + reasonable gear ratios can get you the ability to make big horsepower and get good fuel mileage.
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