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I get 31 + MPG........... downhill in a strong wind avg. about 16-17 MPG lifted, heavy, 33" tires, 4.56 gears checked with GPS and gal. used for mileage.
I don't feel to bad now with mine with the carbed small block.
Seriously, that's damn good since I'm only getting 14.5 bone stock! I estimate I'm seeing about 22.5 freeway but it's tougher to guess since I don't do many freeway miles.