Echo GT-222ES Operator's Manual page 13

Fuel
Fuel supply
Before you start
 Recommended mixture ratio; 50: 1 (2%) for ISO-L-EGD
Standard (ISO/CD 13738), JASO FC,FD grade and ECHO
recommended oil.
 Never use two-stroke oil intended for water-cooled engines,
motor-cycle engines.
 Do not mix directly in engine fuel tank.
 Do not add so much fuel that it reaches the mouth of the fuel
tank (A). Keep the fuel within the prescribed level (up to the
shoulder level (B) of the fuel tank).
 Tighten the fuel tank cap securely after refuelling.
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