Double check your door for the OE tire size. Those would be large OE tires for a 4cyl. I would guess in the range of 205 or 215's were what came on it.
The 4cyl. does require quite a bit of gearing to make anything happen. I would check the rear end ratio to see how bad it is. Your Dana 30 up front will go to 4.88.
I would be tickled pink if my Jeep got 20mpg
Happy Jeepin.
Don
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