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I've mentioned this before but going to say it again...IMO, crickets are not detrimental to the operation of your car. However, running 91 octane on spirited driving (maybe even regular driving) will lower your IAM from knock. I've logged my IAM with Shell 91 before and it can get as low as .50. Now with Ultra94 it rarely goes below .9 on the street (has gone down to .7 at the track).
You're leaving a lot of timing on the table by running sub optimal gas.
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