Comment by tptacek

It depends very much on the whiskey! Most whiskeys are somewhere in the 40-48 ABV band (they're definitely not all diluted to exactly 40%), but "cask strength" whiskeys go all the way up to the mid-60s (the idea of cask strength whiskey is that you're supposed to dilute it yourself; it's sold undiluted so that more of your money is going towards ethanol than water).