87 ethanol free vs. 93 w/ ethanol?

2 replies to this topic
  • SpED66

Posted December 03, 2010 - 11:36 AM


I've been running 93 octane with 10% ethanol in my bikes (see my sig) & adding Sea Foam gas treatment at each fill up.
Recently found a station close to home that has ethanol free gas, but only offers 87 octane. I'm told they will be moving to 90 octane ethanol free in the near future.
Just wondering if ethanol-free might be the better choice despite being lower octane? Or what about adding octane boost to it? I've heard that straight gas burns cleaner/more efficiently & yields better fuel mileage. Not as hard on rubber & plastics, with less residual buildup too. :thumbsup:

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  • Lead Head

Posted December 03, 2010 - 12:45 PM


87 octane is 87 octane. 93 is 93. You might get away with 87, but it will probably ping/knock.

Run the 93 and don't worry about the ethanol. My 450 has had the same E10 93 Octane in it since October as I haven't been able to ride that much. If it's real cold out, it can sometimes be hard to start, but runs fine otherwise. The ethanol problems are really overstated.

  • orangyktmthing

Posted December 04, 2010 - 07:24 AM


In michigan, there has been ethanol in our gas for over ten years and if taken care of properly, there isn't an issue. I have left e10 in my bike for 2/3 months when I don't have time to even drain it out (damn careers!) and it starts almost as normally as fresh gas. From there, I have pulled carbs apart and they look just fine inside. You really want to use the higher octane fuels, though.

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