[peid]

I thought the same thing as Hockey Freak, but the weight still wouldn't make that much difference.

I think you were just driving slower making sure you didn't lose your cargo and were very easy on the gas to not let the cargo fly out the back.

I would guess the tailgate weighs around 75-100 pounds. I had mine off once to put the Trail Seal on and it was heavy but not heavy enough to make a difference.

Tests have been done and proven no noticeable effect with or without:

Air Gate
Tail Gate Up
Tail Gate Down
No Tail Gate
Soft Cover
Hard Cover
Full Shell
or whatever else.

Companies don't spend millions on wind tunnel test equipment to not know where the airflow goes. It simply goes over the tailgate.