I guess we should clarify--what type of driving are we talking? Highway, city, wheeling? For whatever reason, I was thinking mostly highway driving, which should net ~13-14MPG?
With 33s and a front bumper, with all roof rack stuff removed I got 17.5mpg (adjusted for tire size) on my last all highway tank.
but was packed with the family and I was pulling a trailer full of crap and had no regard for speed limits, I was just in a hurry to get home. Both AC's blasting 11.75 months/year, 295 Nitto TG's, 1.5" lift, sliders, TJM bumper, new plugs, O2 sensors, etc. Mix of premium/regular. Roof rack removed. If you obsess about MPG's you'll be forever stressing out in a LC. Just use the skinny pedal and be glad you're not driving an FJ60!
At least the 100 moves when you goose it. Honestly, not to offend, but I'm skeptical of the repeatable nature of people's MPG claims here. I'm sure they happened as described, but are typically the exception, not the rule. I did get close to 20 MPG between fillups once, but it was a 50 mile drive at ~50 MPH and mostly flat along the Gallatin river between Big Sky and West Yellowstone.