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Most everywhere I've been, there's usually only a ~.10 diff in 91 and 93. I always use 93, even before I got the blower and supporting mods.
I'm not going to cheap out on the fuel for car. 0.10/g for even a full tank is nothing compared to the amount of $$ in my car.
Plus, knock on a blower engine isn't something I want to play around with by using lower.
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