Sta-bil is very popular in North America. I use it in small engines, it does seem to help. I don't put anything in the Zed for the 5 months of storage. I fill it with fuel beforehand and drive it about 30 minutes every 4-5 weeks. No other special measures. Going on the 4th winter of ownership and never had any issues in the spring.
Fuel stabiliser wouldn't hurt, but I'm not convinced it's necessary for larger engines.