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First, thanks for not jumping all over me for being a little pissy. Some things just get to me; I appreciate you not getting bugged.
I've never tuned a car, just maintained them and upgraded a few suspensions over the years, so I really don't have enough experience to give you a good answer. However, all of the cars I currently drive "require" minimum 91 and suggest 93. I have two close friends who are both in-demand (meaning, the Mercedes dealership occasionally calls THEM when they can't figure somthing out) expert mechanics, and one of them never worries about the octane rating; he burns nothing but 87 no matter what he's driving. I tease him about it, but he says the difference in gas mileage isn't worth the difference in price, and that the electronics on modern fuel systems are more than up to the task of dealing with the lower octane.
Extrapolating on that, it would seem that burning lower-than-ideal gas in a car tuned for 93 would result in poorer performance, but I don't think it would cause damage. Of course, the absolute truth is that I don't know.
Thanks again..
Barry
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