I'm from ontario too. Why do you put 91 in it? You should not. Stay with 87 and had some gas stabilizer.
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The only harm I could see is higher octane fuel burns slower which is more susceptible to carbon build up. It would have nothing to do with the low compression engine, all engines running high octane fuels will be more susceptible to carbon build up. So running high octane fuel in a spark is just exposing it to unnecessary carbon build up with no advantage.
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More carbon build up but even then it would only be in certain rare situations that you would have an issue, 91 octane won't completely burn in a low compression engine so more of a waste of money, I always run 87 octane fuel and never had an issue, if you are going to have the fuel sit for a while then definitely put fuel stabilizer in it, using the machine week to week though is not a problem.I can't see how running 91 would hurt a low compression engine. It would just be a waste of money at worst. The fuel is still being detonated at TDC, no pre- detonation.
I may be wrong here, but just wondering how it would be harmful.
Awwwh **** no, I won't let ethanol touch my marine engines. It attracts water/Moisture! Sure fuel stabilizer will disperse the water in fuel but I still don't like it running through my engine. I ride my spark up in the North Channel and all of the harbours have 87 Ethanol free fuel... at $1.40/L. You gotta pay to play though. A tank usually cost's me about $30+-So, I must be the only one running ethanol free fuel in the spark? I would rather run 87 ethanol free, but as irony has it I live in the chemical velley where it's made and it's not available to us.