915iS Fuel

Category: 915iS Technical Questions 5 months ago

Getting ready to start flight test on an AirGyro 915.  I have 2 local fuel options

- BP 93 Octane “Invigorate” with between 8 and 10% Ethanol

- 91 Octane with no ethanol.

Anyone have any recommendations?

  • Re: 915iS Fuel

    by » 5 months ago

    There is nothing wrong with <=10% ethanol in the fuel.

    Both will power the engine just fine.

    When dealing with a turbo engine, the higher the Octane rating the better.

    93-E10 will pretty much guarantee that you won't see any water condense in the sump.

    On the other hand, I will guess that the 91-E0 is going to cost significantly more.


    In my area, E0 gas is Marketed to the boating crowd.

    Noone has been boating in northern Ohio since last October so any E0 gas in the pumps has been sitting there for at least 5 months.

    The 93-E10 is much more likely to have the pump tanks refilled a few times a week at a busy station.  Something to consider.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated.

    Thank you said by: RotaxOwner Admin

  • Re: 915iS Fuel

    by » 5 months ago

    Thanks Bill, good thought.

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