was looking around (bored) online and came up with this website:
http://www.theautochannel.com/news/2...11/140100.html

scroll down to where the spec's are and it says the evo 9 recommended fuel is Premium unleaded (RON98). i did a litle research and came up with its either equivalent to 93 or some places say 94 octane. just curious...on a stock evo 9, if there even is such thing....what do you all run for octane? 91? 92? 93? i try to run 92 or higher but usually 92 (where im stationed 93 is non-existant). just traded in my 03 evo 8 where i was tuned for 93 but i guess im being a little paranoid? lol. but seriously though, anyone ever heard of this RON98 stuff?

 

RON is just a way of measuring octane. With a stock Evo you're fine running 91+ (as displayed on US pumps) octane. If you're car is tuned for 93 though, you will not want to run lower unless your 93 tune was really conservative. Just get your car tuned for the gas you plan to run. I personally got tuned on 92 but run 93 daily just for a little extra safety margin.

 

I run 93 just to be sure u would prolly prolly be ok with 91 but i dont even chance it

 

http://www.btinternet.com/~madmole/R...RONMONPON.html

Other markets refer to their gas levels differently. US uses Pump Octane Number (PON).

 

Yeah, 98 RON(Rearch Octane Number) gasoline is equivalent to the gasoline advertised as 93 octane gasoline at U.S. service station pumps. The U.S. pump rating is arrived at by averaging a particular fuel's Motor Octane Number(MON)and its Reasearch Octane Number.

Thus, on U.S. pumps you should find a sticker advertising that the gasoline is: MON+RON/2

 

yeah thats another website i found. says RON98 is 94 octane....just wondering why the manufactur says RON98 instead of 93 octane....kinda stupid if you ask me

 

98 R.O.N.(research octane number)= 93 Research + Motor Octane/2. Chew on this and digest it.

U.S. Pump Octane=Research Octane Number + Motor Octane Number/2, or, R+M/2.