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Very nice work. From mid 50s up to about 80. About a 45% improvement. Few of us do that well.
Better gearing lets your engine reap the rewards of less aero road load. Unless you operate in very hilly country (doesn't sound hilly with a55 MPG base) the MPG effect of weight difference is not overly significant.
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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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