Bad gas or tune issue?

[bonomo53]

This is the first summer with my ARH headers and i'm getting knock on 93 in the upper rpms. I thought in the winter it was just winter blend but its still going on now. I get around 2-3 positive knock when i hit like 5k and up. If i run e85 its all negative. I added octane booster and got rid of the knock also. So i'm not sure if this is an issue with my lund ff tune or just bad gas. My ngauge reads 9.8% for most of the 93 in my area.

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[EFI]

Do you go to the same gas station every time? Maybe try getting gas somewhere else.

Bad gas happens, but I can't imagine you've been getting bad gas for almost a year now...odds are that you would've found a gas station with good stuff. So I'm leaning towards something with the tune maybe commanding too much timing.