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tonycarreon · 09-30-2013, 02:10 PM

smy: the octane rating is different between the US and Europe. our 91 is your 95, our 93 is your 98...

personally, i'd rather the higher rating over pure gas.

the times i've been lucky to get a few tanks of "pure" gas have made a difference - slightly better MPG and better butt dyno result. but i've never tried the mid-grade pure. so you'll be trading one drawback for another. the engine will retard the timing and result in a loss of power, but most mid-grade is 89, not 91. technically i think 91+ is considered premium, though i've only seen it in high elevation locations.

09-30-2013, 02:10 PM	#7
tonycarreon Registered User Join Date: May 2009 Location: Frederick, MD Posts: 1,396	smy: the octane rating is different between the US and Europe. our 91 is your 95, our 93 is your 98... personally, i'd rather the higher rating over pure gas. the times i've been lucky to get a few tanks of "pure" gas have made a difference - slightly better MPG and better butt dyno result. but i've never tried the mid-grade pure. so you'll be trading one drawback for another. the engine will retard the timing and result in a loss of power, but most mid-grade is 89, not 91. technically i think 91+ is considered premium, though i've only seen it in high elevation locations. __________________ "Speed has never killed anyone, suddenly becoming stationary... that's what gets you." Last edited by tonycarreon; 09-30-2013 at 02:16 PM.