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I have achieved a 40-50% improvement in my truck's MPG with just driving, gearing and some light aeromods. I started out with a diesel and a stick. A 40 MPG Crown Vic would get huge improvements with a diesel engine and a manual transmission.
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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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