Average Reviews:
(More customer reviews)I purchased 6 bottles of this product for use in my Mitsubishi Evolution, since where I live the maximum octane I can buy is 91. Based on research I had done, it looked like this product could effectively raise my octane from 91 to 94 based on the amount of fuel my tank holds. I figured at a premium of $10 per tank of fuel, it would be worth it if it indeed did reduce knock. Once I got a logger hooked up to my car that could measure knock, I found that the car was indeed seeing quite a bit of knock even with the additive. The map I was running was based on the car running 93 octane (where no knock was detected). I continued to log the car in a variety of situations, many temperatures (from 30 degrees up to 80 degrees) to validate the results. I began to suspect this additive wasn't doing anything, so I ran the tank down to nothing and put in a fresh tank of 91. I used the same Shell gas station, for consistency of fuel source. The next log showed that the knock was actually REDUCED when running straight 91 octane vs. having the additive in the tank. Now I doubt this product creates knock, but my point is that I could find absolutely NO value in this product for my application - as far as a knock reducer - which is unfortunate at $10 each. If nothing else, my recommendation would be to buy no more than 1 or 2 bottles to see for yourself. In the end I had to have the car re-tuned (read: de-tuned, greatly reduced timing) to handle the crappy 91 octane fuel without knocking.
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