I buy non-ethanol from time to time, I buy E-10 most of the time. I use either Stihl or Amsoil mix and generally a gallon at the time. I have NEVER EVER had a fuel issue with my saws, mower, generator or blowers. My saws with sit for months at a time with fuel in them, same for the generator. I generally dump the fuel in my saws and run them dry, the generator always has fuel in it.... I have never used a fuel treatment. I believe if you buy quality fuel BP, Shell, Exxon etc you wont have problems. My Land Rovers sit for months at a time, I use BP 90% of the time and I have never had an issue...