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Ok, I'm not the grave digger here, but what everyone needs to know is that that research and M number of 93 is about right for coastal areas where there is better compression.
The Octane number can lower 1 number per 1000 ft of altitude into like Denver at 5280 ft.
The turbo moderates that somewhat, but reality is 90 in Denver is about equal to 93 on coast.
I'm on high Plains of West Texas at 3k ft, and run 91.
Gas is dirt cheap in the US, and my X1 will probably even average 24 mpg in it's life.
That's a lot cheaper than what your dealer maintenance bill will be.
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