I've found the biggest things that help my mileage in the Jeep are to not baby it up to speed (once warmed up, that is). What's strange is when traffic allows, and I really get on it (to the point where I'm hauling off the line compared to most people, 3k+ rpm shifts), I actually get better mileage than normal driving with 2500 rpm shifts. Part of that is from the slushy torque converter though. When I first got it, I got just over 11 mpg on an all-city tank. Then, I realized I wasn't getting on it hard enough, and picked up 1.3 mpg in the same driving for the next tank!
Coasting down to stops, and keeping it to 60 on the highway makes a huge difference too. Once up to speed and the TC is locked, this thing likes to lug down pretty low. The tranny will keep the TC locked in OD down to 36mph, which is 1050 rpm. It still accelerates from there, and will climb most hills doing 40 (1200 rpm) like that.