I cant get 99ROn around where I live so my Cupra live son 97 RON BP Ultimate with the occasional 99 RON V-Power every 3 or 4 tanks full.
No problems with noticeable loss of power and it still pulls like a train.
You CAN run the car on 95 RON but higher octane fuel will be better for the engine.
97 is close enough, and if you getting it from a busy fuel station, it'll probably be higher than 97. To be able to quote 97 it has to be at at that minimum standard after a period of time. As a fuels RON drops over time as the chemicals etc added usually break down.
OMG.. how will I manage with only 285hp.. lol.
Video above is by Fifth Gear about whether it’s worth spending the extra..
If that is comparing an engine ECU that is tuned to run on 95 fuel, sticking 98+ fuel in it is never going to give you a HP gain.
But an ECU tuned to run on 98 is going to give you the HP its supposed to, and 95 runs the risk of detonation and/or reduced fuel consumption as well as lower power output. With higher grade fuels being more common place now, more and more manufacturers are pushing the boundaries by programming their ECU's based on more stable fuels.
So if you want to spend all this time waiting for (and moaning about) a 300hp car, only to stick fuel in it that gives you 285 and reduced your fuel economy, then what are you really doing?