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I would be more concerned with the fact that it is 2 years old than I would with the octane, make sure there is no dirt or water that could have gotten in from moisture build up over the years.
the higher octane fuels will be less resistant to combustion under compression. you won't find the knocking that used to be the case with old engines running lower octane than they were designed for, but you will lose a few horsepower. Also, I don't believe octane booster does much, if anything at all, at least from the articles/tests I've seen.
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