I have an 07 JKUR with 37s. I get 11 mpg.
I keep my tires inflated on road, I have a bullydog tuner, every 6 months I clean the throttle body, air filter, pcv valve and spark plugs. Sometimes I even get 12mpg!!
Once I Regear from 4:10 to 5:13 we will see what happens but honestly bud, that almost as good as it gets lol.