Just a little that is perhaps OT,
Living in the country of origin (Sweden) we have only 3 quality grades all measured in RON according to ISO 5164:2005, namely 95, 96 and 98 octane. My old -82 245 runs on either, without knocking sensors and such fancy devices - hey it's a B21A engine, one of the few that can still be maintained with a screwdriver and a monkey wrench (adjustable spanner for the british). No fancy electronics there thank you very much! It does get more power and runs more even when using 98 but I haven't noticed any significant increase in mileage. So normally I use 95. So this whole discussion is a bit strange to me really :-)
/ Johan
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