The guys/gals with the most success pound away on three areas: driving, aerodynamics, and gearing.
If you are willing to trash your car, you might squeeze 1-2 MPG out of it, but don't kid yourself you can make the engine run any better than the factory engineers can.
Look at the folks who have the goods and imitate what they do.
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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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