I did a boil down test on Cool Power 30% Heli fuel and got 22% oil, just like advertised.
But Cool Power is full synthetic and Omega is 75% synthetic/25% castor, except the Omega 4 stroke, which is 50/50.
I run Cool Power with 1 - 2 ounces of castor added in my helis. Actually a 50/50 mix of 30% and 15%. And BTW 30% Cool Power is orange, not green.
I run Omega in my RC airplanes.
I have a bunch of SIG fuel for my control planes, once I get one actually finished.

Both pure castor (25%) and Champion.