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Originally Posted by HardcoreZ28
Yes....with the tailgate up a pocket of air forms in there to take up the space and most of the air goes right over this pocket. If you open the tailgate the pocket can't form and you get turbulence down there.
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this is correct. picture a convertable with a soft top driving down the highway. the top is held rigid because the air inside the car is at a higher pressure than the air rushing over it. same concept with the air in the bed of a truck.