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Well MON is a lot lower than RON and the whole thing is apparently hugely affected by the exact blend of slimy stuff - one refinery may kick out 97 RON that has 88 MON and another refinery a 97 RON that has 86 MON.
Found this on a racing site:
"The number shown on the black and yellow sticker on the service station gas pump is the average of the RON and MON, or antiknock index (AKI). If the sticker shows an AKI of 92, RON is typically between 96 and 97, and MON is typically between 87 and 88. The RON and MON can vary slightly but still must average a minimum of 92 to have a pump posting of 92. Higher octane unleaded fuels will have a greater difference between RON and MON. For instance, 76 Unleaded Racing Gasoline has a RON of 106 to 107 and a MON of 94 to 95, which gives an AKI of 100 to 102."
So AKI is the average of RON and MON and it seems to imply that a 96/97 RON normally works out to about 92 average.
So I'd guess using 99 premium you are probably looking at an equivalent of maybe 93-94?
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