What oil to gas ratio do you use on an echo GT-225?

For the Echo GT-225 string trimmer, you should use a 50:1 oil-to-gas ratio. This means mixing 2.6 ounces of 2-stroke engine oil with one gallon of unleaded gasoline. It's important to use high-quality 2-cycle oil to ensure optimal performance and longevity of the engine. Always refer to the owner's manual for specific recommendations.