our sports are mapped to use either 95 or above. My 172 mk2 runs very well and good on 95. I saw a controlled test on the gadget show or something like that, our level of perfomance car (think it was a current Golf GTi) resulted in approx 1 or 2 bhp increase from 98 RON, the difference was only marked when you tried 98 V's 95 in Evo's and Scoobies and would no doubt be essential on certain mapped/turbo'd units.
You know, if it makes YOU feel better or special then carry on using it in your Sport. My mate ONLY uses OPTIMAX in his Mini One,.. makes him feel special, a kind of fuel snob IMO. I've told him countless times his car's ECU is designed to use 95 and above, but hey he likes it.
A FOOL AND HIS MONEY ARE SOON PARTED