I have had the truck about 5 weeks now. It has 115,000 miles and is stock as far as I can tell. The tires are about 31" with no lift.
The truck seems to have plenty of power, drives and handles great, just poor MPG.
I recently towed a 16' box trailer weighing about 5500 lbs. The fuel milage then was about 7 MPG. It is killing me at the pump.
I know the oil was changed at the dealership before I bought it, but when the air, oir and other filters were changed I have no idea. I typically drive withing 5 mph(over) of the speed limit. I do not take off quick at lights. I am still getting used to driving this vehicle.
If you have a buddy with a programmer get him to hook up and pull the codes for you . the dealer will charge $50-75 for it but it will save lots on not needed parts. Welcome to Powerstokes annonomous !!!!