There's a whole range of fuels available in Japan, same as here. 100RON is pretty widely available though from what I've heard, and quite a few Japanese cars are specifically tuned for 100RON so it's obviously around.
Japan doesn't use MON to measure the octane of their fuel; AFAIK only backwards countries like the US and the UK do that.
I spoke to a Japanese friend about this a few years ago and yes, they quote 100 RON for their fuel, and the MON number is 10 points lower, at 90 MON. The USA quote a more techinically corrected number, if you look at the testing methods that determine these numbers, they use (RON + MON) / 2.
Mitch.
JAP OCTANE FUEL
Wed, 18 August 2004 13:19
