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[thaharlequin]

Your mods shouldn't cause a huge hit to mileage during highway cruising, just if you get on the gas and then on the brakes a lot. IME, ~27-28mpg at ~70mph highway with one or two windows down and the same hwy/cty percentage is normal even with ~550lbs of people and another ~150lbs of stuff. A SC won't cause a whole lot of drag unless it's pumping a lot of air.