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My M2 isn't tuned, but my old N55 335i that was tuned with MHD had timing pulls on 91 octane gas when the car was bone stock and running the stock map. Stage 1 didn't seem to make the timing any worse.
For me, the fix was filling up with 92 octane from WA whenever I could as it would barely have any timing corrections. Just in case I couldn't fill up down there I always had a couple small gas cans of e85 that I could add to our crap Canadian 91. I would mix 10-15% e85 to a full tank of 91 and that would also fix the timing corrections.
I don't think I'd tune an M2 where we live unless you're willing to jump through the hoops of getting better quality gas.
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