i did a bit of diging and came up with this:
http://www.btinternet.com/~mad....html
rumor is that japanese premium is rated at 100 RON. if someone in japan could plese verify that i'd be damn happy.
so if all of this is true then 100 Ron = 95 Octane...hmm
mods, i posted this here since i hear most the ron vs octane questions arising in type r related questions. if you feel the need to deleat this thread, its cool. i posted it in tech too