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Which octane should I use?



I'm trying to figure out what BMW recommends/specifies for my 528e.  My
owner's manual says 87 AKI, or 91 RON.  The pumps (at least around here) say
(R+M)/2 method.  How do I determine the (R+M)/2 equivalent to the 87 and 91
mentioned above?

Aaron
'87 528e
'82 Scirocco
'70 Beetle
'87 Jeep Cherokee 4.0

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