You can see over in my info that I've got the '11 Outdoorsman too.
I run 89 octane and have a very open exhaust and CAI. I have NEVER gotten over 16 mpg unless on a road trip. I'm almost exclusive in-town driving, with MDS off, and get 13.5 mpg every fill up. I don't granny it, but I don't kill it either. I drive it like a truck. It's loud and I love to hear it.
None of the mods I did help mpg AT ALL. Made some more power though.
Remember guys - what your computer says is probably about 1-1.5 mpg better than actual hand calculating. I've kept records EVERY time I've filled up since I bought it a year ago and the computer is always more generous.
Also, the Outdoorsman has 3.92 gears - better for giddyap as opposed to the 3.55 in other 1500s for better mpg.