I live in PGH PA. Should I use gas stabilizer in my riding mower and gas I have in cans?

The stabilizer prevents the fuel from varnishing (that what I always heard it called). I have used it for about 5 years and had good results. You could also run the engine totally out of fuel but that doesn't help for the left over in the cans.

I have used it for many years and have not had any problems