Originally Posted by JER-1
What rear end gears you have in that truck best I can get is 11.5 mpg.and what mods???
I have the old 4.10 gears in my 2005 f-350 dully
Im almost certain I have 3.73's cause this thing flies!!
I have a straight exhaust, full EGR delete from BTS, and get that mpg on Cales 140 tune. When my truck is running right I dont think I could get it down to 11.5 if I tried!!
Seems like just the EGR delete helps alot b/c you are always burning clean air instead of exhaust. I can definitely tell my 35's killed my mileage at highway speeds though. If I had stock tires and a properly running truck I dont doubt I could hit 25mpg with careful driving on the highway!