What I do is buy, 1 gallon of gas, and use 5 capfulls(cap from moped's gas tank) of oil. It should be only four, but most of the time you are running at/or close to full speed, and the extra lubrication cannot hurt.
Also I was told to use a synthetic two cycle oil, but I think I am going to stop using the systhetic oil, because it is expensive. $8.00 quart.
Does anyone else have any opinions on the use of synthetic two cylcle oil?