Assuming your engine is operating as well as it can (fresh plugs, oil, filter, etc) and you're not lugging it there's nothing you can do for mileage. The poor mileage is a function of pushing your brick-shaped Jeep through the air at high speeds, not the engine. The very best thing you can do is slow down. Past 70mph or so, mileage takes a huge nose dive. The slower you go, the better your mileage will be on the highway. Simple as that.
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