[Richard L]

Hello Zak,

I have been told in the past, 15% is worth about 5-6 points. It is difficult to be exact on M50:W50.

Methanol raises the octane chemically (raise the auro-igniton threshold) whereas water regulate the burnt rate (as race fuel) and suppress peak tempearture spikes (onset of knock).

I think there are lots of information of this topic on this site, just need to spend some time on searhing.