Yes, the 10% ethanol will be mandatory starting next month across the country. I believe that premium will still be able to not have ethanol in it. I would recomend not running fuel with ethanol in it unless you plan to periodically clean your carbs. Also dont use 10% ethanol gas in your lawn equipment, its not designed and will cause you issues. Trust me, thats part of what I am working on now, unlike your car, your lawn mower is not designed for any ethanol.