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If you are reading a knock of -11.8 you would hear it with your own ears. Radio off, do you actually hear the motor ping at all? If not, it is most likely a false knock of some sort.
I would agree with this. -11.8 you would most definitely hear. False knock is common with low engine loads. If you're getting out of first into 2nd, and don't add enough gas, you will see knock. I would only worry if your WOT and you're seeing knock events occur.
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