08 f-450 deleted, H&S tuned, I get 14hwy(65-70mph) and 8-10 in town. Towing I average around 8. Before deleted i was getting 9 on the hwy and 6-7 in town and 4-5 towing. All hand calculating. Everything changes pushing it beyond 20psi boost!!! If you bought this truck for mileage or another 3/4 ton plus truck. Then you you are twisted. If you want a truck that gets great mileage you need to be looking under 1/2 ton!!! These trucks are made to work!!!

 

when I owned my 6.4 my lifetime average as 11.5 over 86K heavy towing miles. Probably 80% towing.


Great towing motor.