I agree with all of the above. An 02 4.0 is distributorless, so it's got 1 big coil rail on top of the plugs and no wires.
If you don't mind switching Jeeps, an XJ (Cherokee) is actually lighter than your TJ, and correspondingly will give a bit better mileage around town. They're just as capable, and also available with a 5 speed (like the TJ), so getting a 5 speed XJ would be a win-win for mileage.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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