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I had a 14 Rubicon on a big lift with 35s, roof rack, bullbar, sliders and a heavy ass Kaymar rear bar on it and it did around 17 litres per 100km with me caining it everywhere. I would expect a stock one to do better than that.
Put a couple of tanks of 98 (with no ethanol) through it and drive it aggressively everywhere (plenty of trips to the redline). Make sure your tyres have plenty of pressure in them, make sure the air filter isn't super dirty and if its auto make sure the torque converter lock up is functioning properly. After all that go back to normal fuel (no ethanol) you should be able to get at least 13-14 litres per 100 around town and 11ish on the highway.
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