One part 10% oil, 10% nitro glow fuel

Two parts high test (premium) gasoline

I have had no mixing problems, and I've had the mixture sit for weeks at a time.

One note for everyone however... Gasoline starts going bad the moment you mix it with oil. My personal rule when flying Ultralight Airplanes with two stroke engines is that I won't fly with fuel that has been mixed for more than two weeks. (Most people fly with fuel up to a month old without problems however.) Our smaller model airplane engines aren't as octane sensitive, and will run ok on older fuel, but I did notice my Poulan 42cc running a bit ragged the other day (on Gas/Glow). Then I realized the fuel was almost three months old. I mixed up a fresh batch, and the motor runs fine now.

AV8TOR