ORIGINAL: altavillan
I have the same bottle Bass. Mix it however you need. Following engine manufacturers guidelines would be a place to start. With experience adjust from there.
RTK An airplane engine is alway operating at 100% of throttle setting. That is imo severe duty. With their labeling Amsoil should be mixed at 50 to 1.
If you are running your plane at 100% power all the time then you are either completely underpowered or are flying a racer. Having said that, I just got back from the motorcycle shop, where I was looking to buy some ashless for break-in on my new engine. While I didn't find any there, I did take notes on the available synthetic oils and their recommended mix ratios. These were all designed for 2-cycle use.
Honda HP2 100% synthetic 32:1 only
Motorex 2T "up to 50:1"
Spectra SX 100% synthetic 32:1 only
Bel-Ray H1R 30:1 - 50:1
Red Line Synthetic 16:1 - 100:1
As can be seen, not all synthetic oils are designed for use at 100:1 mix. This is why it's important to a) not make generalizations with regards to mix ratio and b) read the instructions on the bottle of the oil that you are using.