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Well...not sure I can truly answer your question, but maybe I can help clarify your octane requirements.
In the U.S., the octane ratings posted on the pump are in the (R+M)/2 method, also called Road Octane.
The R is short for Research Octane Number or RON, and the M is short for Motor Octane Number or MON. The average of the two is what is listed on the pump.
RON is always higher than MON.
If AMG specified a 93 RON rating, then you'll probably be ok running 91 octane U.S. gasoline.
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