For those that run 95RON all the time, RTFM - I'm sure it states only to run 95RON in emergencies and even then get Super back in it ASAP.
Just because you cant feel it loosing power doesnt mean bad things arent going on. I will leave you to google what happens when you run a car on high det map all the time, its not good. You may be lucky and the car may run "ok" but you may also be left with a nice bill as Bennett says. The car is tuned to run 98+, so why try and be cheap and put less in? It thinks it has 98RON in it, and when it doesnt its constantly winding back the timing, but it only knows to do that because it gets det and winds back the timing