Given the hue and cry about the disappearance of 92 Octane from California - I checked the manual and it says, ".....91 octane or higher". My question is will 92 or 93 octane give better performance for a stock s2k than 92 octane???

If 91 is the same for our engines as 92 or 93, then I can stop mixing in the 2 gallons of 100 octane in every tank and save myself some money!

 

Has anyone noticed any performance differences with running a tankful of 91 octane?

I'm just curious 'cause I can still find 92 octane (quite easily) in N. Cal.

 

That is one of the principal reasons why I do not wish to be living in the States, how can less than 95 octane fuel be still around? Damn, places in Arabia and Dubai have 120 octane fuel standard everywhere. This is bad for such a wonderful country.

 

The scales are different. 120 overseas is probably similar to 89 here.

I didn't feel a performance difference when using 91 but when I switched back to 93 there seemed to be more power.

YMMV.

 

TTT

 

Moneeb, where are you finding unleaded 100 octane gas? I'm not real up to speed on how to acquire high-octane gas (I usually just go to Texaco or Chevron), but the only 100 octane gas I've seen in the last 12 months was aviation gas, and that was leaded (really really bad for our catalytic converters I hear).

 

Hoof, there is a 76 station close to my place which has 100 octane racing fuel. Problem is that it is 5 bucks a gallon. I usually mix in 2 gallons per tank with the rest of the tank being 91.

Can somebody out there concretely answer my question? Manual says 91 - does that mean 92 or 93 are useless??

Thanks

 

[QUOTE]Originally posted by Moneeb
[B]

 

http://www.repairfaq.org/filipg/AUTO/F_Gas...ml#GASOLINE_001

Interesting info on octane. He recommends not mixing different grades of gasoline in attempting to raise octane due to possible density differences preventing mixing.

I also did some research on this "American gas sucks...We have 100 octane here!". In the Japanese and Euro markets, gasoline is labeled by its RON measure (research octane number which is always higher than the MON value). In the US, the average of these two numbers is used.

http://www.iash.nrl.navy.mil/newsletter19/...9/nl19tech.html
This is a study of Japanese gasoline. According to this, by U.S. octane standards (RON+MON /2), premium gas is typically 94 octane and regular grade is 86. By Japanese conventions, this would be labeled as 100 and 90 octane, respectively.

I also found several sources that said that European gasoline is almost universally MON = 85. This means that a 100 octane Euro gas would be 100+85 /2 = 92 octane by American standards.

My 2 gallons.

 

Using fuel of a rating higher than 91 will not show any gains in power. The octane rating of fuel is a measure of it's resistance to detonation. Higher compression engines require higher octane values to keep them from detonating. Using anything above the specefied values in the owners manual is actually replacing more of the fuel with an octane additive. Buy the 91 and smile

Ole
White/Red