Live in a rural area, like me. Most of the roads that I travel have little or no stop signs or traffic signals. Speed limits generally range from 35 to 55, mostly the latter.

I average about 18-ish mpg all the time in my "city" driving. Highway is about the same. And I'm running an automatic with 32" tires at 35 psi and have a Shrock bumper and sliders.