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'91 Jeep Wrangler 4.0L

Dear AquaTune,
I've just got to tell you, after ordering two of your standard AquaTune kits, I had one of them installed on my '91 Jeep Wrangler with the 4.0L fuel injected engine. This, as the mechanic says, is a very tired engine ‘cause it has over 200,000 miles on it and I tend to have a “lead foot”. Not only is the hp fantastic, my mileage jumped from 11 – 16mpg with my foot into it. Can't help it, I love the hp increase. Now I'm upgrading my other vehicle to an AquaTunePlus. I will certainly keep you informed on the results. Thanks,