A 50 to 1 oil to gasoline mix ratio equals how many ounces per gallon?

A 50 to 1 (50:1) fuel/oil mixture indicates 50 oz of fuel to 1 oz of 2-cycle oil. There are 128 oz to 1 gallon. Divide 128 by 50 to find how many ounces of 2-cycle oil to add to 1 gallon of fuel: 128 ÷ 50 = 2.56