octane number and misc.

[Philippe Courant <accf-club@xxxxxxxxxxxxxxxx>]

Hi,
i just wonder what are the different octane number gazolines you have in 
USA ? I know that the US octane number is different than french (RON) 
number and seems to be (RON + MON) / 2, so a 98 RON (= 88 MON) would be 
a 93 .
At this time i run my '57 Imp with unleaded 98 RON (so 93 for you) and i 
want to switch to 95 RON ( = 90 US gazoline, don't know if it exists..). 
My compression ratio is 9.25/1 so what is your advises ?
I've found a table in the middle of 
 http://www.faqs.org/faqs/autos/gasoline-faq/part3/  (paragraph 7-2) but 
i don't know if the "octane number requirement" means US or another 
octane number.

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Philippe COURANT (Pau, France)- Webmaster des sites ACCF et C-I-F
Imperial 1957 Crown convertible
Buick 1996 Roadmaster wagon

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