I've been using Star-tron for 7or 8 years now, no issues with my carb vehicles or small engines. Here in Canada, hard to find fuel that is completely ethanol free, most people here don't realize that fuel company's here can say ethanol free as long it is below 4 %, that means they can use 3.9 % and say its ethanol free, thanks Federal Government. I use premium fuel in all my carb vehicles and small engines. As for the small engine's, when I take my can to fill, take one of my vehicles that can stand ethanol, put a few liters in the car first then fill my can. Think about it, your getting say 2 gallons in your can, between the switch valve ( almost all our pumps are multi-grade, you chose which you want to pump ) and the nozzle there is around 1 gal of fuel, so in 2 gal you get 1 gal of whatever the last guy pumped and 1 gal of premium that you want, put some in your daily driver first so your can has only the good fuel.