Still, I add about 30ml of Morey's upper cylinder lubricant to a tank full in the XS. And I use 95RON. Not that I have ever noticed any difference between 91, 95 or 98 in the performance that I get from anything I drive/ride.
Maybe i'm the perfect customer for the fuel companies, spending extra for no identifiable reason.
I don't trust alcohol fuel - too many people who have half a clue suggesting it does terrible things, especially to the ancilliary parts.