Its not my primary fuel, but I inject methanol at about 20% of my total fuel.
Anyways, I've done a good amount of research on methanol. We all know its a higher octane, that it has great cooling properties and that its stoich is about half of what gasoline is. But what i didnt know was that it actually ends up producing more energy than gasoline. Acording to this article Methanol is approx. 9500 btu's/lb as opposed to gasoline at 18,400. But since you run over double the amount of meth as you do gasoline it produces more total btu's of energy than gasoline.
In my experience and that of other friends of mine, the more methanol you use the more power it makes, even if you maintain the same air/fuel ratio.
This article breaks it down:
http://www.smokemup.com/tech/fuels.php
Also VP fuels is now producing an oxygenated version of their Methanol called "M3". I've gone through about 2-3 gallons so far and while I havent confirmed at the dyno yet, it seems to be making even more power (higher trap speeds) than regular methanol.