I've varied it but at the moment I'm using 60% meth and 40% water by volume. I was surprised too. Obviously the intercooler is sucking all the benefit out before reaching the IAT sensor. Oledoc is setting his up to spray after the intercooler and I'm awaiting the results. I'm not tuned for meth. My reason for spraying was to lower ECT's as well as IAT's and it hasn't lowered either one. I ordered a new intercooler from Rob because my original one is leaking. It's possible that the leak is impeding cooling. Time will tell.

Les