How do you mix gas and oil for 21.2cc leaf blower?

To mix gas and oil for a 21.2cc leaf blower, use a 50:1 fuel-to-oil ratio. This means for every gallon (128 oz) of gasoline, you should add 2.6 oz of 2-stroke oil. Mix the gasoline and oil thoroughly in a clean container before pouring it into the leaf blower’s fuel tank. Always check the manufacturer's manual for any specific recommendations.