What a coincidence! I was going through my whole fuel stock, even the weed killer stuff, to see what I had on hand. Fuel is hard to get around the St.Louis area right now, so I wanted to see what I could dredge up just to sport fly with and save my good stuff as long as possible, and I found a couple of gallons of Dukes Fuel. I will verify what Brad says, 10% nitro and 20% all castor. I had some other Fox fuel that was a 10%nitro-22% oil half castor and half synthetic that I got from Ken Nash in Joplin, MO several years ago, and mixed the two half and half and came up with something than runs pretty good in my fun fly airplanes. I used Dukes Fuel a lot when I first started because we could get it at the hobby shop I worked at back then, so I'm pretty sure of the oil content and such.
Type at you later,
Dan McEntee