RE: Fuel mixing advice
With acetone, 3% is the recommended amount for 2 strokes and 5% for 4 strokes. One of our club members uses it in his 4 strokes and says it eliminates back firing and spitting props off. As far as starting and idling goes, it's got about the same affect as using 5% nitro in the fuel but has no noticeable affect on power. IOW, if you're using nitro then you don't need acetone.
As far as petrol in glow fuel goes, that was an ingredient used to make an engine more economical in CL team racing way back when because they needed both speed and range from a fixed (very small) fuel tank size.