Sorry I didn't get back quick enough. Paul has a pretty dang good handle on the nitro and alcohol info. Personally I would just take the Nitro 50 and blend it down with M1 to get the ratio you want. It the old days, for every 5% nitro we put in alcohol, I recommended at 15% fuel increase. Once you get past 20% nitro though, the mix was harder to light and you may run into some issues.