What we have here in Canada ( Aspen like ) is either 50:1 premix or 4 stroke fuel. I've been using the premix in all the equipment ( 4 str and 2 str ) for many years. I empty the fuel tank run the motor until it starve, put enough in the tank to run the motor for a few minutes and shut it down. When it's time to restart the equipment, I just add fresh fuel and go. Never had any problem since I go that way.
PS. : It's sadly nearly time to do it in my bikes, the weatherman is calling for snow in the next 2 week.