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It's the tough thing about MPG.
A quick test proves nothing. Drag racing, sled pulling, even Bonneville: A couple minutes at the most and you know who's who and what' what. Not true of MPG. You need AT VERY LEAST 750 miles to verify results. Long tests lets all the variables wash out.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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