I use 91 in mine. To me, the money isn't that big of a deal. If 91 is $.10 more than 87, then we're talking about less than $.50 extra a fill-up. So, in a month, I end up spending less that $2 more for 91 and I don't have to worry about knocking. Just my line of thinking...
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Matt
2008 Ebony Ninja 250R (a.k.a. "Venom")
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