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My 2 cents, and experience....
To each their own. The users manual for my 2012 128i vert does indeed state to use a minimum octane of 87.
As mentioned on another thread, six new Bimmers, three 3's, two 5's, and a Z3 Roadster. The Z3 was sold after a trouble-free 106K miles, and 13 1/2 years. I never ran more than 87 octane in any of them......and never noticed reduced performance. I guess I need to "track" my car and check it out......not.
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