I suspect Morgan knows much more than me. I also suspect they have more money and enjoy adding to it.

I and everybody at my field drains their planes tank into the jug it came from then run out the fuel fuel lines.

Can't say nobody has ever or will ever have a problem but so far I have had no problems and nobody I know has had problems either. At least we don't know it if that is a problem, we have had reluctant engines. Mostly old engines. I always shake my fuel up a bit before fueling.

As for the Saito I run Power Master 30% heli in mine. This was a suggestion by Horizon and Mike McConville and my LHS. Messy but nice performance. Saito says 10 to 30% synthetic.

I have run my Saito .72 on 15% Cool Power as well. It runs smooth and strong with that too. For all the rest of my 2 strokes I use the Cool Power 15%. Probably go to that myself in all my engines when the other jugs are empty.

I think you will be happy with the 15%. As for the impurities its probably true. True in you car too. I am am not dumping fuel on the ground or taking the unused fuel to the recycle place if there is one. At what it cost a gallon I don't worry about it.

If you have a tach. check out the differnce of the two fuels with the same prop.