Ive been using toluene for a while now, I took the safe option and gor the Material Safety Data Sheet (MSDS) when I baught it. I have used it with bp ultimate 20l Toluene 40l bp, this means u can be more aggrecive with the timing and so forth. Now I run it with avgas. Same deal 20l toluene with 40l avgas. Cant believ the differance, B4 I was making 268RWKW with bp and toluene now with the Avi and toluene 316RWKW. Big differance the tuning is vital to to this though