23 mpg with 4x4 is pretty good, I doubt gearing will make any difference. 2200 rpm at 60 is only 150 above my stratus and you have a 2.7, it couldn't keep 60 mph at 1770 on most roads. If you think it could, try overside tires, tall & skinny, I don't think you'll like how 1st gear works.
Even if gearing would make a differnce, not $1500's worth(if your going to tear into them get some LSD's), install LRR tires when it's time, drive slower, drive smarter.
It's not the 300 lbs in steel, it's the 4-5" higher and xfer case losses.
Still if you expected more the 23 your expections were wrong.
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