Hello fellas, you know what? I'm just going to stick to Downunder's original advice and brew the the 3% acetone, 20% castor and 77% methanol. Downunder, you won me over (twice now) and there has been no evidence to dispute your claims. In fact your working from practical tests and not just theories. I have very limited experience and just want to brew my own fuel as cheaply and safely as possible. Your suggestions suit these needs. Thanks mate. Regards, John.