We’ve all heard of Ethanol, but what is it exactly? Ethanol is a renewable fuel made from plant material known as biomass. Ethanol is contained in 95% of all US gasoline and is used to reduce air pollution. Great right? Not for your outdoor power equipment! Ethanol can have devastating effects on power equipment. Once in your gas tank, ethanol turns to water and wreaks havoc in small engines like lawnmowers, trimmers, blowers, snowblowers, etc.