Echo X7522340000 Safety Manual page 23

FUELING
NEVER use raw (unmixed) fuel, or any high-ethanol fuel (ethanol content
greater than 10%) such as E20 -E85, in a two-stroke engine.
Fuel containers filled with 2-stroke engine fuel/oil mix should be identified as
containing fuel/oil mix, and should be stored separately to prevent using raw or
high ethanol gasoline in a two-stroke engine.
23