I'm no veteran but over the summer anyway I pushed 25MPG's out of a 4.0L I6 4x4 Cherokee rated at 19MPG Highway. That's with only a grill block and skid plate. So I'd say 30MPG's should be easy for your setup. With 35MPG's being more of a challenge but do able.
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Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
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