Ok, so my 09 in Florida gets 13.5-15 city and 17 hwy at 70mph. Pulls 10k, not a weak engine by any means... on paper is lower on hp and TQ compared to other gas options but according to test out there, it has zero problems keeping up or beating the other offerings. The 6.0 is no slouch, I’ve owned 2 of them and they pull very well for a gas engine. Oh and pulling 10k i get 8.0-9.0 in Florida. I have seen it as high as 9.5 mpg but don’t trust the truck computer. Oh and the figures I gave are hand calculated, I average 8.5 when pulling camper around 65mph. With 92k on the clock and paid for, she will stay with me a long time.