We have to run on a Winter blend here which is 10% ethanol. Most if not all vehicles are engineered to handle it. If I remember correctly, I believe I read that it actually helps raise the octane rating. When it first came out years ago, we had problems with older engines (including bikes, outboards, etc.) having plastic and neoprene parts soften and "melt". But those parts have been redesigned to cope with an alcohol mix. One plus - you don't need to add HEET.
BTW - my '05 manual recommends 98 RON!
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