Seems you can still get "The Purple Brew Just For You" from Fox, at least the last time I was on their web site a couple weeks ago.

My 15s ran great on it, especially after performing some mods written up in FM and MAN by people like Riley Wooten and Larry Scarrinzi. They ran even faster on Blast and High Nitro fuels by Fox, which were something like 40% nitro. Blast and Hi Nitro were great for the .049s.