When I first got it, I was lucky to see 13, a lot of that had to do with the fact that I never had a truck that was this quick, so I had to enjoy it.
Now, 7 months and almost 16K miles later, I am flirting with 17mpg, and it's slowly creeping towards 18.
Couple of things that seemed to help:
Highway driving at 70mph on cruise (I used to drive 78-82, because the truck rides so well)
Keeping it under or around 2K rpm's in town (again, see above)
I know these keep the fun out of driving these trucks, but with gas like it is, every little bit helps!
