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Alright guys, I just got my FRS on Friday and I, stupidly, put a full tank of 89 octane in it yesterday. I'm definitely noticing the knocking. 93 octane is pretty readily available around me and now that I know how bad anything less is I will be using that in the future.
But what should I do about this tank? Should I wait until it's almost empty to fill it or can I put some in around half a tank?
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