I am relatively new to the business and have 3 handhelds, 2 WB's and a ZTR. After reading about the potential effects of ethanol on small engines I started using ethanol free gas from a station in town. On one visit I noticed that he sold Startron, he said that folks had good luck using it so I tried a bottle for when I needed fuel and it was not convenient to get E-free fuel. I have to say that I have had no fuel related issues since using the E-free gas or the Startron in the E-gas. I will continue to use the Startron as it is considerably less expensive to treat E-fuel than to purchase the E-free gas. Especially since on my last trip to my dealer I noticed that a more concentrated version was available which brings the price per gallon even lower. Not a very scientific analysis, but, being a small one man gang, I will stick with what works for me.