Maybe someones mentioned this already, but folk should know that the RON numbers are legal minimums. Invariably the fuel is of better than posted quality and you can discover its actual RON from the fuel companies by phone.
Reason I know this is I used to have a Quattro (WR engine) and it really needed 97 or 98 Octane. Seemed to run fine on 95, but as the car had no knock sensor (unlike the later MB & RR engined ones) I was worried about it detonating.
I contacted Shell (I think) and the told me the actual RON number of my local fuel (at various specific sites) and it was always around 97 or 98. There are losses in shipping, decanting and storage, so they always make it better than 95. If they produced it at 95, a small deterioration would render it substandard.
So, the stuff you get may be better than you expect. I only checked the 95 RON stuff, but it might be worth contacting a fuel manufacturer and having a chat for those who are really interested in this.
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