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  1. #1
    nicjak's Avatar
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    RON and MON finally make sense to me

    always found the US sticker on the ski a little hard to understand.

    Anti-Knock Index (AKI)
    In most countries, including Australia and all of those in Europe, the "headline" octane rating shown on the pump is the RON, but in Canada, the United States and some other countries, like Brazil, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Pump Octane Number (PON).

    in reading this i now have a better understanding for our fuels down under.

    ive always ran 98 but after reading this i dont feel so stressed anymore looks like i can go down to 93 using caution if i ever have to.

    California fuel stations offer 87, 89, and 91 AKI (91, 93 and 95 RON) so looks like anything in australia above 95 is acceptable with 93 being just below the 90AKI minimum.

    given the requirement of a minumum 90 AKI.


  2. #2
    gmoeller's Avatar
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    Quote Originally Posted by nicjak View Post
    always found the US sticker on the ski a little hard to understand.

    Anti-Knock Index (AKI)
    In most countries, including Australia and all of those in Europe, the "headline" octane rating shown on the pump is the RON, but in Canada, the United States and some other countries, like Brazil, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Pump Octane Number (PON).

    in reading this i now have a better understanding for our fuels down under.

    ive always ran 98 but after reading this i dont feel so stressed anymore looks like i can go down to 93 using caution if i ever have to.

    California fuel stations offer 87, 89, and 91 AKI (91, 93 and 95 RON) so looks like anything in australia above 95 is acceptable with 93 being just below the 90AKI minimum.

    given the requirement of a minumum 90 AKI.
    Great info. I've never understood this, and also wondered about the minimum of 90 AKI in my 300x....now I know.

  3. #3
    2011 N/A champ 2011-2012 turbo champ elpeladodelsamba's Avatar
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    pon is ron+mon/2 . the 90 us is like 95 in europe . i would use 90 pon or more , or 95ron or more. allways use the better fuel you can get . if fuel is not correct : cabummmmmm

  4. #4
    www.eastcoastpwc.net Scott's Avatar
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  5. #5
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    YOU AREN'T RON MON! C'MON GEET OOF ME LOWN... Thanks for clearing that up, the other interesting thing to do with this is altitude, the aki at altitude does not need to be as high because of the drop in dynamic compression ratio. Thats why at sea level we have 93 pon fuel and in colorado or new mexico they have 90 or 91

    Sean

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