Quote:
Originally Posted by 2000neon
I can't comment on whether or not it is better to extend past the tailgate or not. To do a partial tonneau cover, I believe it is best to separate the covered and uncovered parts of the bed. Basically have a vertical wall at the front edge of the partial tonneau cover, from the bed floor to the height of the cover.
This is what Gale Banks did on his top speed record setting Dakota.
Sidewinder Dakota:
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In an interview with Sport Truck Magazine,Glen Sharpf,of GM's Aero Lab (patent holder of the 1/2-tonneau cover) reported that some of the low drag performance of the 1/2-tonneau was owed to the opening underneath, back to the inner face of the tailgate.
The low pressure of the locked-vortex captured by the cover is communicated through the opening to the gate.The pressure differential created across the gate,front-to-back, is part of the drag-reducing function.