In Europe, the standard was to have 95e5 fuel (RON 95 gasoline with 5% ethanol). New guidlines however, make that countries are switching to selling 95e10 (10% ethanol). Finland e.g. (where I live) has made the switch, while other countries like the Netherlands are waiting it out, to see what problems will arise.
Especially in Germany there was quite some uproar, as some manufacturers were proclaiming that the e10 fuel is bad for the cars. A lot of people there are fuelling 98e5 now instead (even though it's more expensive). Also here in Finland some people make that decision.
I'm driving myself a 2010 Toyota Yaris. Will there be any negative consequences to any parts of my engine if I continue to use 95e10? Is it better to switch to 98e5 instead?