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Looking at Post #345, I am taken how similar you cap looks to the black apparition I had on mine for a few years. See my avatar - its the last surviving picture of it.
The BZP cap has a better (shallower) angle and I whacked mine off at the tailgate. (I have a long truck and a short garage.) But both taper in the plan view, leading to smaller wake area. BZP's has to be lighter than mine. I used rubber matting for the skin and that demanded a sturdier structure.
My short and too-steep cap was the best MPG configuration I've had. BZP should do well with this one.
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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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