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5.6% @ 33.33%
On the Cd 0.525 1982 Chevy C-10 tested by GM,a 33.33% of box length partial tonneau cover was good for a 0.03 drag reduction,or 5.6%.
We can only say that for this particular pickup,this length of cover yields this much drag reduction.
SAFETY NOTE: moving any significant weight behind the axle affects the polar moment of inertia of the truck as well as front/rear weight bias on the tires.
Be careful!
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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