If you don't cover the bed and aggressively deal with your gearing, you will have to drive like Wayne Gerdes to get close to your goals.
Aero, gearing and driving. Those are the MPG fundamentals.
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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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