Ethanol-Free Gasoline
It is a good idea to use ethanol-free gasoline for power tools. To find out why, click here.
This site shows you where ethanol-free gasoline is sold locally: https://www.pure-gas.org
If you pump gasoline from a pump that also sells ethanol-based gasoline, pump the first three seconds into your car's tank. This will clear out the ethanol-based gas from the pump's hose. Then pump the non-ethanol gasoline into a gas can.