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What I would suggest with your Jeep is similar to what I did with my 2000 Jimmy; use a ScanGauge or equivalent to find you gas mileage at all speeds from 70 down to 40 in 5 mph increments with A-B-A testing. Once you've done that, you'll know what your best mpg speed is. Then wherever possible, drive at that speed. If it's too slow to be safe on a freeway, try to find an alternate route where you can do it and blend in with traffic better.
Second, I found that blocking off the grille gave me about 2 mpg improvement. But keep an eye on the temp gauge to make sure the radiator is still getting enough air.
Third, pump up your tires to max pressure, or if you're brave, even a bit more - 50 or 60 works good.
Finally, when I took the roof rack off, it gave me a 0.4 mpg increase. Since I almost never used it, and it's not all that hard to put back on, that was an easy decision!
With these four things, I was able to get 26 mpg on a tank. What did NOT help much were deleting the wipers, folding the mirrors back, or doing rear fender skirts. Those things help some people, but didn't on my Jimmy.
Oh, go with Mobil-1 synthetic oil, as thin as you dare. I just put 0w20 in my Swift. Had been using 0w30 during the summer...
Then get fanatical about coasting up to stops. Always scope out the next intersection & try to figure out how soon you can pop it into neutral and coast and still make it. Hopefully, you will get good enough you won't have to brake much. Ideally, as you're rolling up to the intersection, the light will turn green, traffic will start moving, and you can avoid coming to full stops. Taking off from a rolling condition takes far less fuel than taking off from a full stop. I even try to park on slopes so I can start rolling before I even start the engine.
Doing these things will probably help you a lot, but I too doubt a V8 Jeep will get 30 mpg. I hit 30 in my Jimmy a couple times during testing at 40 mph, but never could get that for a whole tank.
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