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Discussion Starter #1
It just dawned on me that you guys in the US might not be describing 'RON' for the fuels you use.

Our fuels here are typically 95 octane or 98/99 for 'premium'. But this is RON.

Are you guys quoting AKI - the average of RON and MON - when you are talking about min of 91 octane?

MOn is typically around 12 units below RON, so AKI is around 5~6 below RON.
 

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It should say it on the gas pumps.

The Volt manual refers to the 'posted number' so I guess it is AKI.

In that case, FWIW, in EU we're told to use 89~90 AKI octane fuel, because this is what '95 RON' is, which is our 'regular'.

I use 99 RON, which translates to 93~94 AKI.
 

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At the stations around here, there's usually three grades of gas at the pumps, 87 octane is regular. 89 is plus and 91 or 93 is premium.
 

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Our octane rating is a average of motor octane and research octane. It says it right on the pump (R+M)/2
 

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It is AKI, the average of the RON (R) and MON (M) rating...but as the photograph above shows our pumps actually show the formula, they don't use the term AKI.
 
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