By "extra", I meant gas cans full of it. I usually top off all the various tanks prior to packing things away in the fall. My motorcycle and portable generator live in my insulated, attached garage year round, so winter is very mild for them as well as dry relative humidity-wise. My push and riding mowers live in our shed, and both of them are over 20 years old without any fuel system problems so far, so I guess I'm doing something right.
I have a generator in the new trailer, so I'll probably do much the same with that too, since there's no effective way to completely drain the tank.
2015 Octane T32C
2012 Ford F-250 Lariat/FX4/Diesel