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When I owned my Cherokee, I was getting 19-20 mpg highway pretty consistently doing 70-75 during the summer. Gas mileage was often down to 14-15 mpg during the winter. I didn't have any mods besides a cheap custom intake (It was a foot or so of exhaust pipe with a large cone filter on the end, attached to the stock rubber neck on the throttle body). I removed my roof rack, and had slightly larger than stock tires that were old and hard enough they probably contributed to my higher mileage.
The 4L Cherokees are damn fine vehicles from a mechanical reliability standpoint, but I wouldn't expect any great efficiency without some major mods. They're not remotely aerodynamic, so there's room for gains there. Ditching the mechanical fan for an electric wouldn't be a bad idea.
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