Well made my 5 hour trip from Michgian to the Chicago last week, now have about 1700 miles on truck so far. Best mileage I got was 18 going 55 MPH approaching downtown Chicago. I have the 3:31 gear by the wa...

I did everything possible to try and get more, but just couldn't. Going there at 70 MPH...barely keeping up with traffic I could get nothing more than 17 and some change.

I'm heading from the Detroit area to Grand Rapids MI today, about a 3 hour trip, I'll be on my best behavior again, staying off the boost and see if I can get to the almighty 20+ as printed on window sticker.