I have been towing my 5th wheel (30 foot Rockwood/8000lbs loaded) and have been getting only 9 MPG average on trips. I tow with a 16K Husky slider, removed the tailgate, LT E-rated 18 inch tires, airlift airbags, NCD front kit (truck sits perfect under load now), run 87 octane, drive in 4th w/tow mode on and I control the shift points manually when a hill comes up. Is only 9 MPG normal? What do you guys get? Next year I will probably be going across to CA from NC, and am considering trading for a GM 3/4 ton diesel. I love the titan, but this MPG is horable under load. Plus, I think I am pushing on payload with the pin weight of around 1300. I have been overlooking that since I have the airbags and the 5th has its own double axle brakes w/ a Reese controller. Comments???