I took a long trip with my daughter in her 98 with the 2.5 and 5 speed. The mileage varied a lot with how fast we went. At 55 mph we got a little over 20 mpg. At 65 it was around 17, and at 70+ it was 15 mpg or less. The wind resistance of the jeep really makes the 2.5 struggle.
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