[gtxpooch]

Note that the students found that conventional camper tops
and removed tailgates hurt, but tonneaus helped about 11%.

I'm not sure that I agree totally with the above quote because when I open the tailgate on a 300 mile(one-way) trip I take quite frequently, I save full 1/4 of a tank on my 97 Ram 1500 5.9 4x4 Auto/Overdrivewith the tailgate down.

I also try to keep the RPM's to under 2000 if I can also helps quite a bit. Yes, it takes alot longer to get to cruising speed but I usually ain't in that big of a hurry.