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1/3rd length
Back in 1981 Ford told an American Plywood Association associate that as little as 19-inches of plywood,ahead of the gate would show at the gas pump.
You'll like the 1/3rd length.
I'll find the GM tonneau cover patent.It has a drag beakdown for any percentage length.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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