I havent calculated it any but I've noticed the change just watching the gauge. The reason I can say Im getting better mileage is because with the tune, the gauge isnt moving as far to the left as it did without the tune going to and from some of my normal trips. For example it took an 1/8 of a tank to go to east side Norman and back before, now its only taking about half that with the tune. I'll hand calculate it one of these days
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