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Hmm... .5oz/gallon = 6oz/12 gallon's would result in a 10 point reduction.
I added 3oz last tank full trying to silence the crickets. which would equate to about a 4 pt drop for the tank. We only have 91 octane here, so I may be neutering the car with 87!
I have been logging more knock recently (thought it was temperature related), but this may be what is really happening.
Guess I better become friendly with the crickets!
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