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I'm tuned on Chevron 92, usually run Chevron 94 out here...
A lot of the US Tuned Canadian Evo's (from evom/evoxforums) run Petro/Husky out here because most people tend to see less knock.
On my previous tune I used to get quite a bit of knock on Chevron 94, but on my most recent tune I haven't had any issues *knock on wood*.
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