I just got mine up and running again. Its got 190K on the original motor, headgasket fixed under warrenty around 75K.
I just got 150 miles on half a tank which is pretty typical and around 250 to 275 (approx. 17.5 mpg) on a full tank depending on how much hills I drive over. Thats is not compensated for the 4.30 to 4.88 gear swap that I did last summer. However, I like to hammerdown in 3rd and 4th.
I run 31's, Jacob wires, K&N, downey headers, no front skid plate, heavy ass front bumper, sliders, allpro rear bumper, no sway bars, and a just recently busted rear shock. So with that, I'm not that unhappy with the gas milage. Of course, when I feel bad, I drive a vechile that gets 400 miles on a 15 gallon tank.
Oh yea, I'm alittle over 3000 rpms at 70mph w/ 4.88s, 3500 @ 80.