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octane boost

  1. 4.6L Tech
    I plan on getting a tuner for my car and I've noticed that they give you the option of tuning for either 91 or 93 octane. I have never seen 93 octane offered where I live, so I was wondering if it would be a bad idea to add octane boost to 91 octane gas and tune it for 93. In the manual for my...