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Location: 31 | Your best chance at finding a gas station with ethanol free premium is with shell, I think around town here their premium contains ethanol, but I see it here and there while traveling to the various locations I fish, I just save those destinations on my GPS and top the boat off there on the way out.
The specs say to should run 89 minimum octane with a Yamaha 4 stroke 250 to get full performance out of the engine. I understand it would run okay on the 89 or even the 87, but if pushed hard at full throttle it could potentially knock or ping with the 87, there is a sensor that retards spark advance to reduce performance if detected so I wouldn't hesitate running 87 if it was the only option available.
As far as running premium with the Yamaha ring free, I researched it pretty heavily when I first bought the rig and there was nothing Yamaha has written in that regard. If there is I would certainly want to see that, same with running lean. I would be interested in anything else you care to add Steve because I certainly value your opinion. I fully understand that four strokes are clean running to begin with, but you would think that Yamaha would've said something if that was a potential problem. I agree that it's over kill to run it all the time, what can I say... 
BTW, I've actually had people tell me that the Yamaha additive is just some gimmicky deal for Yamaha to make a few extra bucks. I honestly find it hard to believe they would put their name on something that was not extensively tested and found to be beneficial for their motors. Is it worth the extra money, I guess it is to me to have the peace of mind that I'm doing all I can.
Edited by Jerry Newman 3/19/2012 9:48 PM
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