We are running an 05 FTL with a MBE 4000 set at 415HP. It is a full 40' with 100" sleeper, LG, Lift Axle, Reefer. It weighs in just under 32,500 empty/wet. We run 60/62 and get 10.5 with a light load and axle up, 9.5 with 5000# load and axle down. We run low rolling resistant tires...