I got mixed mileage...depended on my speed an terrain. Interestingly enough leaving my home and making to pittsburgh I got 34mpg, I was traveling between 65 and 70. Its a lot of hills and winding highway. Was also the only tank of Sunoco I had the entire trip, might have a difference. The rest was Valero I think.
The rest of the trip I was between 70 and 75, sometimes hitting 80, and I got 29mpg. Its also really flat and straight. The trip home I was also traveling a bit faster and got about the same mileage.
Around town at home I average 20-22mpg but I'm also really heavy on the throttle driving mostly backroads up steep hills and valleys.
Overall the biggest effect on mileage I've noticed was my exhaust...it dropped way down around town after I welded in a 2.25" exhaust. Maybe its the lack of backpressure, i dont know.