Startron is what I use. I used to use Stabil or run them dry, but I have been told that running them dry for storage leaves all the seals and what not in the carbs dry and causes them to crack and have as many problems as ethanol gas. I don't know that I believe that, I've not had issues with doing so, but maybe I was just lucky. But I've had great luck with Startron, better than anything else I've used.