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I have an SCT X3 with custom tunes that is working real well for me. I have the 87 octane economy tune which I don't think works real great, an 87 ontane tow tune which works great and a 91 octane tow tune which is even better. I'm running the 87 octane tow tune every day and have great throttle response, improved shifting and torque converter lock up strategies with about the same mileage as stock. The 91 octane tow tune is even better, but I run the 87 tune so that I can run regular fuel without a problem. I get about the same mileage towing with either tow tune, But the 91 octane tow tune is a little more responsive with trailer on back.
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