In Canada only Colas can be caffeinated (see mountain dew (canadian)), so here the Mountain Dew contains no caffeine. Dopey me bought 600 ml (or whatever that is in Imperial measure) one night on a business trip in Pittsburgh just before bedtime and slammed it back. Well, in the United States of America there's a lot of caffeine in that little bottle.
Up here, it looks like reactor coolant, actually.