I think you can reasonably expect to hit 50mpg with no mods and just driving habit changes (that's assuming you have a manual transmission)
If you have an auto, that changes things a bit. Prolly 45ish.
With mods, the sky is the limit.
As for lowering, it's gonna definitely help.
There was a thread in the aerodynamics forum that refrenced solid numbers for lowering gains, something about an aeromodded Ford Fusion bonneville car.
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"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.
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