I'd say 50% distilled water and 50% pure methanol. You can pick up the methanol at any Home Depot or you can buy HEET fuel line anti-freeze at auto zone/advanced auto parts. HEET is 99.9% pure methanol.
Run a 50/50 mix. I have some friends who run their own custom mixes depending on what their doing. 70% water and 30% Methanol is safe aswell.
Personally though I'd run a bit more meth than water but that just me and have seen good results from some retarded fast cars! Hope this helps, if you have any questions feel free to PM me.
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