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What type of gas

Posted: Wed Nov 16, 2005 11:54 am
by guitar guru
So I have this 1986 Suzuki GS 550 ES, and I've been putting the premium gas in (91 octane here I think). I have no owner's manual, so I was wondering if any of y'all, based on that info, think I can switch to cheaper gas, or if I just stick with premium.