I haven't tried AvGas yet. Just haven't made it by the local FBO to get some. I would prefer to not use the organo metallic AntiKnock (MMT,TEL) because of the potential effect on the glow plug. I got one run on the little Shindawa with 1/3 ST mix and 2/3 93 octane before my wife came back from shopping. The 93 octane here has ethanol (10%). The first run vibration was down significantly, but still not as smooth as it was runninng on EI. I'm going to try the next run with the same mix, but adding 10% toluene to the gas. I also tried increasing the exhaust back pressure with little effect other than dropping the rpm.

Ethanol is also a good octane booster, however with the gas already containing 10% I don't know if more will have any effect.

Regarding the CoolPower Oil w/castor. Iprimarily got it for mixing glow fuel, but this afternoon mixed 2cc oil with 20cc gasoline. It went right into solution. The mix is standing to see if there is any seperation.

Will