Has anyone w/ a new silverado made runs with the tailgate up and then down... An older guy I met told me it made a big dif in his truck. I didnt believe it did... but maybe like .05 or somethin small. Lemme know if any of you have gotton times w/ it up and then with it down.
thanx,

 

Nineball's stock times

Here is Tony's times with his 5.3. May be what you are looking for.

 

Great post... thanx for the help man. Guess the old guy didnt know what he was talkin bout. I figured most of the air stayed above the gate becuase the cab is soo much higher. i will leave mine up <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />