High profile - gas mileage

my PP is 13'4" to the top of the 2nd A/C unit, I pull with a soon to be gone 6.0 Ford it has 4.10 gears and I don't relly think my mileage is much difference with or without the camper, I get about 10.5 either way...I only use the truck to tow, I did have a cruiser and the mileage was the same,

I like Keith's answer! If you stop and think about it---A higher rig is going to be pushing more wind. Plain and simple. You guys that are wondering about it, just stop and think about the times you pulled into a really stiff head wind or one that hits you on one of the front "corners". It's about the same theory as higher verses lower. Either way it amounts to more wind resistance, and less fuel mileage.

In my mind it is a no brainer.  The more wind resistance the lower the mpg will be.  I chose my Cruiser mostly in that it was less than 12 feet tall.  Am able to store it in my shop building that has a 12 foot high door.  The dressing area of my bedroom in my 26RK is 6'5".  Good enough for most american men.  The lowest in the main area is 6'11".  The main thing that would help our problem would for the trucks to go back to the bed levels of 30 years ago.  I do not understand the race to have the tallest truck bed rail.  Lowering the bed rail height would allow the 5th wheels to have a higher bedroom ceiling with less overall heigth.

No they keep making the beds taller so they can have bragging rights on payload area (IE Cubic feet in the bed. 

I'll Keep my "old" Patriot edition Cruiser. I have modified the bedroom floor with carpeted fillers so the floor is level all around the bed. That was most important along with the true mid-profile height. I've never towed a high profile 5'er, but I have to believe if you have more square feet of frontal area you will have more drag on the tow vehicle. JMHO.