I now have around 17k on my 04.5 3500 4x4 quadcab dually. I took a trip to lexington a few weeks ago and it seems my mileage has really started to get much better since getting a few miles on the truck now. When I first bought it I was getting 13-14, just about decided to get rid of the truck because of that. On my trip I was getting hand calcs of around 22 miles per gallon, overhead was reading 26 MPG because of the ramifier. Now getting around 18 MPG in town, the 22 was on the interstate as long as I kept the truck around 60 MPH. This is a really big improvement since I first bought the truck and had the flash done for poor mileage.

 

My truck is not getting very good mpg's. 15mpg unloaded, auto w/ 35's. What does the dealer due exactly???? How much was it??