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I can only speak from experience, but I get very normal tire wear running 48 PSI in my max 48 PSI tires. Door placard calls for 38. Not only do I get improved economy, but it really tightens up handling.
My 2 cents on the fuel filter, can't hurt. My layman's understanding is that good air filtration is much more important for engine longevity than a fuel filter, given that you're not filling up from 80 year old fuel pumps. So called "high flow" air and fuel filters don't improve economy, just add a little power near redline at WOT.
Some things which might help economy in your Jeep include getting narrower, low rolling resistance tires, lowering it a bit so axles and whatnot don't hang down in the wind, and as much in the way of underbody paneling and wind deflectors as you care to put on.
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