My personal best for the '07 4.0 5spd I call mine is 34.9 mpg (I took a picture). It was 35.0 but dropped after a couple seconds of hitting a light. It was about 58 miles of highway driving after filling up. I live in WV, and we have a few hills.
In town where I live the traffic can get a bit congested; minimum of 15 minutes to go 2 miles, and often 30 minutes when the day ends. So it's a LOT of sitting in neutral, and I can get about 17-18.
On the highway; I get up to speed slowly, let the car lose a touch of speed going up the hill (say from 70 to 65). I also run 36 psi in my tires since the car feels way too mushy with the stock 32 psi (Uniroyal tigerpaw GTZ the car came with from the dealer :-/ ) I accelerate more on the downhills, and if I'm already up to speed, will neutral coast. On extremely steep grades known to be speed traps I just keep it in 5th and coast. With everyday driving, I can net 31 mpg pretty normally. Right now I seem to be getting about 28 mpg recently with no change in driving habits, except the car went for a flywheel TSB to the dealer, and came back dirty with a chunked up wheel. Mileage has been pretty bad (from what I had) since. Currently it's sitting at 28.4 with 95% highway.
The easiest way for me to keep things in check is to use the "instant" mileage graph in my cluster (have the 6 gauge due to PP and interior upgrade). With this method I can see how far I'm putting my foot into things based on how few bars I see. The goal is to keep all 7 showing. Prior to dealer, almost any hill would show 4 bars going up, 3 on in town acceleration. Post dealer drops to 3 bars on highway hills, and 2 in town. I'm going to look into things and see wth they did beyond damaging a wheel.
Just thought I'd post a little of my experiences here. The car is totally stock. Oh, and the economy car I have ('90 Escort) had previously gotten 42 mpg on the highway at a steady 75 mph. It's due for a rebuild, and I'm working on improving that. I had a tempo years ago I could repeatedly get 51+ mpg out of on the highway.
It really, really depends on how one drives. Cruise, to me, is not a good idea for gas mileage unless on very flat land. If hills are involved, use the foot. I drive 99% of my time with my foot only.