There's lot of confusion here over beverage sizes.
240mg in a 16oz/473ml can. It also seems to have been reduced back to 160mg.
Even at 240mg it's equivalent to or less than a cup of medium strength regular coffee. And not close to Espresso.
The problem is, it's much easier to drink down sugary beverages than coffee(especially hot).
A few of the "Pure Zero" variants seem to have (or had) a ludicrous quantity of caffeine. If I have any complaint (well, other than that a 16oz can doesn't have 2 servings worth!) it's that I don't know that the caffeine should really differ between them; one might not expect what seems to be simply a different flavor to differ markedly. My solution to that has been to read the ingredients.
> Even at 240mg it's equivalent to or less than a cup of medium strength regular coffee. And not close to Espresso.
Coffee varies but generally speaking if one goes by the "serving size" on an energy drink it's typically on par with coffee: http://www.reddit.com/r/askscience/comments/ip9ia/ive_been_w...