Thank you! Yes, I’d like to keep clear of ethanol- fortunately in the eastern part of europe the 98 is usually ethanol free. I’m not too worried about octane rating, as i have original 150hp with compression rate about 7:1 , i think the lowest i can use is 80 or 87.
From reading the Jeppesen aerodrome directory for Czech Republic at least, most of thr mogas sold is 95 octane only. But ok, depending on the engine and STC you have, 95 might be enough.
In fact, I wouldn’t worry about octane, only about ethanol. And many 95 octane fuels do contain more than a trace of ethanol.
