Thanks Richard.
so I would guess 20% should be around 6-7 point. well I would thing it all depends on which octane you start with... the lower octane you got first the more point you get... so starting from RON93, the lovely RON100 figure should be reachable if 20% 50/50 watermeth is injected
this is pretty mutch good news
I tried to search info on this but couldn't find any.