OK. Then "Keeping highway speeds to 55-60 mph" will probably give you the single largest % improvement of the items you listed (though they'll all help - don't get me wrong).
I'm guessing a 20% minimum improvement, combined. That would take you from 14-17 mpg, approx.
You should
make a garage entry for the Jeep & start recording your fill-ups so we can see how it progresses.