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Once got 21 mpg traveling from minneapolis to chicgo. This was in a 2000 running a superchip 1705 and a walker big truck muffler. Had the cruise set at about 78
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  06 F350 lariat ,6.0 Auto, 4x4, CC, SB, Black, Moonroof, Pwr rear slider, Brake controller, 3.73LS, ESOF, Sec. group, Htd pwr TT's 
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If I wanted betterr MPG I'd buy one of those tiny tire, low to the ground light duty bowties. 
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