I have the 36x12.5r15 on my tj. They measure to 35.5". They wear decently fast(faster than my falken rocky mountain ats but slower than my buddies LTBs). They are loud on the road. I'm sure they don't get as good gas mileage as the falkens(haven't calculated it). But they do amazing off road in every situation I've thrown at them so far. I like them for a mainly off road tire. I use to DD my heep with these tires and it was not as pleasurable as driving with the falkens.
EDIT: I'll also add that 3 of the 4 that I run in normal rotation are unbalanced and are "smooth" up until around 80mph. I say "smooth" because they are loud and they do ride a little bit funny. This is from the wheel weights getting ripped off while wheeling and I have no intention to have them rebalanced because they ride fine.