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It not about cost it is about wondering how the different octanes will effect the car. Mostly mpg wise, because there are a lot of varied accounts from it works fine to only for emergencies and keep off boost. It is purely out of curiosity, and the inability to find a reliable source on the matter. Everyone seems to have their own opinion on this, but someone on here now has a new sti I was just wondering if they were going to look into it at all.
Even the difference between 91 and 93 I think would be interesting. Although I imagine it is negligible outside of computer when it comes to premiums, but that's just my guess.
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