red 6 0-no said:nascarmike-
hate to break it to you but the old 'tailgate' down is a myth. it actually was proven to be not a good thing on mythbusters. it was pretty cool how they did it. what they found was that w. the gate up the wind comes up and over the cab and comes down right behing the tailgate, for that perfect streamlined effect. when the gate is down the wind comes up and over the cab and hits the tailgate in the down position causing more drag.