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I used it way back then thinking it would help improve my gas mileage but it made no difference in anything. Car ran the same, fuel economy was the same, and everything else. My car probably didn't need it anyways.
It won't do anything for the Carbon Build up if your pouring it in the gas tank, if that's what you're thinking of using it for. But overall, its a pretty good cleaner from what i've seen and heard. But, if you're running a good premium fuel, especially one like Chevron or Shell with the good additives, you'll see a minimal effect. It'll make more of a difference for those that run no name 87 gas in their cars all the time.