One thing that is misunderstood about stabil is : for the stabil to correctly work as a stabilizer it does not mix with the fuel. You add this product to your fuel tank , run your equipment then park it . As long as you do not move or run this unit the stabil will work exactly as you would hope, the stabil forms a barrier over the fuel to prevent oxygen from entering the fuel and start the break down process. If you move the unit around or run it you break this barrier and it never has a chance to do what its intended to do.And if you use stabil I would suggest the "blue" marine grade as this specially formulated for ethanol fuel. We not only sell it but i also use it in our shop fuel for all of our repairs.I just use seafoam. There is more to that then just dumping it into your tank. I dont like to use any fuel stabalizers as people have a tendancy to depend on it and abuse it.
(There is no reason to have 5 gallons of gas sitting around for 4 months until you use your mower again. Run it dry or dump it out in your vehicle. Gas pretty much loses its octane in 30 days.) I have also noticed with "stabil", over a small period of time it will seperate, so how can you mix it once it is in this situation in the lines or carb. Im not saying these are all like this but that is my take on it.