As a small engine mechanic I'm pretty familiar with the fuel problems we've been having the last few years. For winter storage I use Sta-bil fuel stabilizer in everything. Add it to the tank and run the machine long enough to completely circulate it through the carburetor. I don't have any starting problems in the spring. I also add it to my fuel cotainers, again no problems.
Best advice yet, add the stabile and drive around a minute and run for 5 minutes shut it off and forget it till spring. Start it once a month for a few minutes if it makes you happy. Some of the new motors seem to be more sensitive to old gas. I had a craftsman snow blower that did not get run enough and pretty much didn't want to start and run when I needed it to. On the other hand I have an old 70's Wheelhorse Horse rototiller and I think I could put terpantine in the tank and run it.