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Dan @ May 8th 2008 4:44PM
Comparing different cars that are similar only in weight and engine displacement is changing too many variables to meaningfully demonstrate anything.
Until manufacturers start releasing SFC plots of their engines, which will be approximately never, comparing the same car with different engines is the best you can do.
And other than niche applications shoehorning existing engines into applications that don't match their tuning, like the smallblock Impala, or the Camry powered Corolla XRS, the mileage bonus for giving up literally a third of the engine is consistently in the order of 5 to 7%.