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There is a discernable difference in power when I burn premium (92) fuel vs mid-grade in my 850 R. I'm assuming that the better fuel allows higher boost without detonation. That said, I usually run mid-grade just to save a few bucks.
 

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I think the manual says you can run just regular (87). I guess it would be okay in a pinch but I, too, choose to run mid-grade gas (89) vs. premium (92)to save a few bucks. Or you could alternate fuel types, if you like.

[This message has been edited by 97R855 (edited 07-20-2001).]
 
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