That's why I went to a diesel engine truck to improve my towing MPG's. With my old 2001, 6.0L gas engine, 2500 Chevy I would normally see 6 to 7 MPG towing a light 30' 5er. I than switched to a 2008 Ram, Cummins 6.7L (diesel engine) and I normally see 11 to 12 MPG when towing a mid-size 5er. This depends on fuel quality and if it is straight D2 and not that BIO crap that BP pushes. I have 7 and ½ years of fuel data to back that claim up. When not towing I can see 20 MPG’s with the truck at 65 MPH.
I haven’t really towed my new Cedar Creek any distance yet; to see if there is any difference in fuel mileage between my older 5er and the Cedar Creek.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67