fuel additives in Winnebago vista 36y

The manual with our Chevrolet Volt makes the claim that gasoline now has a one year shelf life (and will run the car's gasoline engine if needed to insure the fuel is used before it become stale). I always used Stabil in the past but since getting the Volt and reading that, I've not bothered with it anymore. Over the last four years I have not had any problems with stale gas. I've submitted an information request to the American Petroleum Institute and will report on their answer as to whether gasoline is now routinely blended with a stabilizing chemical. I've been a mechanic all my life and over the past 50 years I notice that I no longer have been smelling the stink of stale fuel nearly as often as I remembered whether it's been in a car, lawn mower, or RV. I would pretty much say with certainty that a full tank of RV gas would not go stale in 3 months. BTW, I also own a 36Y Winnie. As a side note, the best DIY upgrade you can do is re-route the power cable from the utility bay to the small compartment just behind it (which is pretty much useless for any storage anyway!).