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I thought a tuner ran dyno comparison of M2 with 91 and 93 and it made a good amount more power on the 93. Of course that's essentially a tuned m235i, but I surely wouldn't run 89 octane and only 91 if there were no better options. I have tune and run 2 gallons E85 and rest is 93 octane. Runs great.
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'15 M235xi | BSM/Oyster/Aluminum | Black Kidneys | RW Carbon Mirror Caps | 40% tint
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