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I was just reading the octane posts. The guy who sold me the car told me to put 89 octane gas in it. I only have 1200 miles on the car but it has all been with 89 octane. Did I do any harm during the break-in period?
No worries at all. The OBC will adjust to pretty much whatever you put in it between 87 & 95 although I understand from a tuner that they are happiest with 91 or 93