Originally Posted by
archangel
uncovered pick up bed all act like parachutes and either slow you down, or you could say, make your mileage down on the freeway.
That isn't true at all about open beds (WITH tailgates).
Mythbusters BUSTED this myth on their show not long ago.
The open bed causes a high pressure area where the air flow is deflected off of and
never DIRECTLY hits the tailgate.
