What gas to oil mixture for a 3 horsepower Tecumseh jiffy ice auger?

From the Tecumseh Jiffy Drill website: Ratio for Tecumseh TVO85 (3 hp), AV520 (3 hp), AV600 (3.5 hp), TMO49 (2 hp), TC200 (1.6 hp) and TC300 (2 hp) engines is 40:1.

For a 40:1 mixture: Mix 3.2 oz of 2-cycle oil to 1 gallon of gasoline.