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The factory tune does indeed knock on 91 octane, and I've seen it knock on 93 octane as well. Most of this knock was at lower rpms 1600 - 3000rpm and with a fair amount of tip-in knock. It did not have knock issues at the high rpms.
The ECU will pull/retard timing if it is detecting knock, regardless of the rpm you are running at.
There have been a few significant factory ECU flash updates since the earlier models came out. You can bring it to a local dealership to have it flashed to the latest factory update if you have not done so yet. If you have a 2014 you should be good.
If you have installed an aftermarket intake, you may be running too lean depending on the intake. Modifications will need a tune the get the maximum benefit from them.
- Bob
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