I'm spraying pre-charger simply for the cooling benefits on the (h)Eaton. Most of the meth/water is likely flashing off before it makes in in the cylinders. I'm not going to pretend I'm an engineer and have it all figured out. I'm a hobbyist that likes to experiment and have fun. Sure, I can run richer on e85, but throwing more fuel at knock eventually nets zero return. Right now my car seems happiest around 11.3/11.4. From what I've read, e30's knock resistance is not that much worse than e85. That's where I believe the water/meth helps out. Not so much it's active knock resistance in the combustion chamber, but it's cooling effect on the Eaton, which means cooler, denser air in the cylinders.
Again, don't read this as science. I'm not saying do what I do. I was just saying hi. I just installed a cam, just waiting for my heads to get done. If I can up the timing a little and run knock free on a 2.8 without meth then cool beans. Next phase will probably be a gen V. I'll take it as far as I can and maybe spray meth again. Next year i'd like to intercool. I'm really gonna piss off some forum gods here when I run e85/meth/intercooler, eh? Crap, I might just throw a bag of ice on the s/c too.