Why do I burn so much fuel???

[WorkinLonghorn]

Personally, I think the tail gate up increasing mpg's is B.S...............

I used to put mine down until I saw a study by some automotive engineers (iirc) who studied the air flow pattern with it up and down and the drag was actually SLIGHTLY less with it up.The theory was that the path of the air sweeping past the cab was infinitesimally better,and the pressure at the back of the cab was ever so much higher with the tailgate UP.
>>But either way isn't going to make much if any difference in MPG.
>>Also I remember them explaining that it isn't like the air hits the tailgate and stops.There is a cushion of air maintained at the tailgate and oncoming air sails past with negligible drag.