Thanks guys. I've been using castor blends all along. I ran 1 gallons of 10%, then 2 gallons of 15%, now back to 10% (I was fine with the 10%, but wasn't able to get it the last two gallons. I now have the LHS ordering 10% for me and for the Nexstar RTF's he sells - I told him it was the right fuel to offer with that plane).

I just got a gallon of Tower Power fuel though, as I had some money to burn there. It's pink, and from recent conversations this leads me to believe there's castor in that, too, although no one at Tower seems to know.

Probably will stick with the 10%, unless I notice some remarkable loss of excitement, but I doubt it.