Per the BMW 1M Manual:
Quote:
Required fuel
Super premium gasoline/AKI 93
Always use this premium grade fuel to obtain
maximum fuel economy and performance.
The minimum approved fuel grade is AKI 91.
Do not use any gasoline below the specified
minimum fuel grade. Otherwise, the
engine could be damaged.
Use high-quality brands
Field experience has indicated significant differences
in fuel quality: volatility, composition,
additives, etc., among gasolines offered for sale
in the United States and Canada. Fuels containing
up to and including 10X ethanol or other
oxygenates with up to 2.8X oxygen by weight,
that is, 15X MTBE or 3X methanol plus an
equivalent amount of cosolvent, will not void the
applicable warranties with respect
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Quick Reference Octane Rating Guide:
102 RON (EU) = 98 AKI (US) - Racing Grade Fuel
98 RON (EU) = 93 AKI (US)
95 RON (EU) = 91 AKI (US)
92 RON (EU) = 87 AKI (US)
per
http://en.wikipedia.org/wiki/Octane_rating
...
What fuel octane level do you put in your 1M?