Here is a good place to start.http://www.jiffyonice.com/Q-and-A.html
Q: What is the correct mixture of oil and gasoline to use for fuel in a Jiffy?
A: The correct ratio for all Jiffy Power Ice Drills is 40 to 1. This means 3.2 oz of Jiffy Two-Cycle Oil is mixed with 1 Gallon of fresh gasoline. If you don't use a 40:1 oil mixture it will void all warranties.