It's been some years since I bought glow fuel, but around here, we seldom saw less than 10% nitro. My guess is that the R/C bods like the nitro for putting more heat into the glowplug and thus better idle. Us too, IMO.
If you need to mix homebrew fuel, it's easier to get reliably available YS/Saito 20/20 and base a homebrew on that, IMO. I'd probably mix a gallon of 0% nitro, 5%-10% castor/10% Klotz and mix that with the 20/20 to get what I need, or alternatively, mixing 0% nitro/15%-20% Klotz and then add 2 oz of Randy's Aero-1 per gallon. It would be good to investigate which Klotz is used, since one is 20% castor and the other is castor free.
I was told this last weekend that I could get CL fuel from the Strom's hobby shop in Olympia, and that I should just drive down and get some. That'd be about 57 minutes drive time each direction according to Google Maps, but with our I-5 traffic being the way it is, I'd bet more like 1.5 hours...somewhere over $26 worth of gasoline to get there and back.
When I go south to a contest, or come back, it's always too early or too late for the shop to be open. More likely, I would stop in Beaverton or Eugene to buy glow fuel. Scott Riese at least used to be able to get the Beaverton shop to stock decent stunt fuel, but IDK what it was or is. It's also out of the way when heading to Albany (FF contests) or Roseburg (NWCLR). Eugene stocks SIG fuel, which I've run, but it isn't my favorite. Better than electrons, tho.
I like the metal cans that Powermaster and VP use/used, tho I do put it in a jug and use a ketchup pump to fill my tank. It makes me crazy to see guys sucking fuel out of an open jug into a syringe with a filter in the hose and then push the fuel back through the filter and into the tank! Please don't do that!
Steve