I have a 2006 Megacab (diesel) 2500 4x4 with automatic trans. I am getting around 13 MPG HWY. I pulled a 3,000 pound horse trailer this weekend 600 miles all HWY flat land at 70 MPH and got 9. 4 MPG The truck now has 3,000 miles on it.
The truck is still all stock at this point. Can someone...