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high octane

  1. anyone running high octane (91+ US or 97+ european) in the non turbo 2.3L

    2004-2009 Mazda3Appearance & Interior
    i was wondering if anyone is running higher than the recommended octane in the 04-09 2.3L mazda 3 motors? i am looking for feedback on this as i seem to find something odd. when i put 93 in on accident last fill up, it seems to be a bit more responsive and seems to be getting better mpg.i have...