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Yup. Too steep.
I had one like that and it was sub-optimal.
That said, it was 1.5 MPG better than a flat tonneau and 3 MPG better than an open bed.
The easy way to approximate the curves they have posted is make the top pitch at what carpenter call a 2-in-12 pitch. Do the trig. That's roughly 10 degrees.
You need the back of the thing about 8 inches about the tailgate.
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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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