Quote:
Originally Posted by ajvdh
And the M2 is one of those cars, hence BMW recommending 98 (RON)/93 (AKI), and requiring a minimum of 95 (RON)/91 (AKI). You will lose power if you use the minimum grade, and, depending on other factors (altitude, temperature, relative humidity), you may fatten up the torque curve a small amount if you go higher than recommended.
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I would love to believe that. Do you have a source? What's the actual, measurable difference in power between AKI 91 and 93? Or even higher octane, using the stock ECU, if your source provides that info?