I was talking to a fellow with a truck like mine, pulling a 5th wheel larger than mine, saying that he gained 1 1/2 MPG by replacing the tailgate with a louvered one. Does anyone confirm that ?
I have a louvered customflow 5th wheel tailgate that I bought off of Craigslist last year for not much, $80 used. I don't see any increase in MPG that I am able to calculate anyway. But it has made it easier to hook and unhook the fiver if I'm on a trip with it. There are other things that would probably help MPG greater than the vented tailgate that one could invest in.