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max psi
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  1. Q50 General Discussion Forum
    I live in a state where 93 Octane is readily available at almost every pump. A person I know with a Q60 says he is able to run 21 PSI on 93, but he has a fairly newer model, so I am not trusting his experience. Can someone who has put a few thousand miles on 93 tell me what your max SAFE PSI is...
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