o you don't !you ask alvyn or alex "icecoub" and both of them have had there cossies for over 10 years and always use 95. As i said i always use optimax, but u don't "Have to use optimax or super" and they dont drive a skoda!
thing is mate 95ron unleaded fuel was like 2 star back in the day when cossies were new
I would only run my lawnmower on it!
ages ago when perol was cheap(er) we actually got a good ron rating however it all changed when environmentalists wanted to save the plannet and not put lead etc in our fuel so they decided to give us unleaded which had a much lower ron/mon rating than good old 4 or 5 star