Six-packed for convenience, these 6.4 oz. bottles are ideal for commercial users looking to mix 2.5 gallons of gas. Tanaka Perfect Mix is what is referred to as a one-mix oil. The oil is formulated so that when mixed at 50:1, (or 2.6 ounces per gallon of fuel), it contains enough of the life giving additives to work in any Tanaka and other air-cooled engine.