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I would have thought you'd have better results. Yours fits much tighter to the cab than mine does.
My differential (aerocap vs open bed) was right at 3 MPG.
Maybe I did better because the diesel retains efficiency at lower percentages of rated engine power.
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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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