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Octane rating vs amount of ethanol in gas

in General Tech Discussion 11 years ago
It is my understanding that ethanol boosts the octane, and that is the reason why it is used. If that is true, does it imply that 91 octane gas has more ethanol than 89 octane gas?

  • Re: Octane rating vs amount of ethanol in gas

    by » 11 years ago

    Hi Mike,

    Trying to boost octane with ethanol isn't their intent. They can make 91 oct. without it. The ethanol isn't in the fuel when it comes into the tank farms via truck or pipeline. It is brought in as clean 91 oct. Then when the tankers fill for delivery at a tank farm it is usually added then. Depending on which side you want to believe it was added for cleaner air emissions from gas burning engines.I'm sure the corn industry loves it too. It isn't going to be an issue with your Rotax engine.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Octane rating vs amount of ethanol in gas

    by » 11 years ago

    There are several reasons ethanol is used. One is to comply with the Renewable Energy Act, which was put in place to require an oxygenate so gasoline left fewer pollutants. Another reason is that it is cheaper than gasoline, so a blender can "spike" gasoline with ethanol and come up with a cheaper product. A consequence of adding ethanol is that it increases octane, but as Roger says there is nothing to show that that is a main reason. Another consequence, but not a reason, is that you don't have to add Heat or a similar anti-icing agent if you live where it gets cold.
      
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  • Re: Octane rating vs amount of ethanol in gas

    by » 11 years ago

    Great info! I am replacing fuel lines now and adding aux tanks for increased range. Flying season is right around the corner!
      
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