I don't fully understand all of the octane numbers. Is the 94 you speak of RON or MON?. Probably RON as super-duper gas in Germany has MON numbers of 98.
Ethanol has a RON octane number of 89.7 and MON of 108.6 per the WIKI chart in the attached link.
I can't see you cooking a piston if you have a US version car with 9.3:1- even if you beat on it - but you did not clarify if US or ROW. ROW has what, 9.7:1? 91 or 93 RON will be just fine as noted with 10% ethanol.
If you have a US version, 89 RON (mid-grade) is all that you need and that may even be overkill.
I do like Shell/Chev/Exxon vs jobber or wholesaler gas.
Octane rating - Wikipedia, the free encyclopedia