If by premium you mean higher octance like 92 or 93, then Premium in the US does have ethanol, only ethanol free fuels commonly found in marinas
or certain gas stations do not have ethanol, though they cost as much as premium fuel does. E10 ehtanol is 10% ethanol, it is extremly harmful if your boat has a fiberglass fuel tank
and will eat through it over time. If it is aluminum
or stainless then no problem. The largest issue with ethanol isfuel is that over time it absorbs moisture much faster then non ethanol fuel, and after 60 to 90 days can seperate. The use of stabilizers does help somewhat. May also want to have newer fuel lines etc and a water
seperator with a clear bowl and check it monthly. I have mixed and used both e10's and non ethanol for several years in my power boat
and have never had an issue other then 12 year old fuel pumps went bad eventually
Yamaha says replace every 2 years so I cant blame fuel. One word of caution, if you use ethanol, use it, dont let it sit for more then 2-3 months.