Opinions on gliders

[Hammerhead]

I have hauled 9 of these Cat 24M graders.
They weigh 110,000 give or take 800lbbs.
Loaded 12'W x 15'4"H x 118'L grossing 183,000 give or take 1500 depending on time of year rigging.
   
I average around 4.5mpg if it's not crazy windy or stupid cold.
I used that picture so that you can get a good grasp of what I mean when I say the load starts 35' behind my bunk, because it does.
Believe me I understand that an open framed car hauler isn't going to average 7.5, but if ANY car hauler, bull hauler, basically anything other than this is having difficulty kicking my ass in the fuel milege department...I'd strongly suggest you're doing something wrong.
At those dims I am routed mostly 2 lane roads, which means a lot of towns to slow or stop for. It also means I am alone so I'm under no peer pressure and I run about 50-55 with them.