I had a 2015 3/4 ton Chevy with the 6.0L gas engine and 4.10 rear end and towed a 9K travel Trailer. 8 mpg - 8.5 mpg was the best I could ever do here in the Northeast where there's lots of hills where I towed. Without towing, I would average 14 mpg (combo city and highway driving). What I loved about the engine is it was a workhorse and had been around forever. What I hated about the 6.0L was it was nothing to write home about when you needed to get on it. I also wasn't much of a fan of the turning radius of the truck. Very wide radius compared to the Ram truck I have now.