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Not to resurrect an old thread, but I was going through an old GZ250 manual for another reason and saw where the manual recommended using 91 octane gas. I will have to check and see if the manual for my '09' shows the same thing.
Bottom line, I tried high octane fuel in my GZ for a short time and it ran really doggy and with a lot less power. Just a quick FYI. Ride safe.
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