For the longest time I was a Red Bull fan.
I still like the flavor of Red Bull, but have developed a new favorite.
Stink'n great [better flavor IMHO] and with more caffeine.
Red Bull has about 80mg of caffeine
or 9.64 mgs of caffeine per fluid ounce.
NOS has 250mg of caffeine or 15.63 mgs of caffeine per fluid ounce.
While looking for caffeine content in energy drinks I came upon a cool tool:
Determine how much of your favorite energy drink it would take to kill you.
Though, this would be a rather unpleasant way to die.