considering the smallest can of red bull has as much caffeine as a cup of coffee (80mg) and a can of rockstar has twice that (160mg) I would say you're off base

considering the smallest can of red bull has as much caffeine as a cup of coffee (80mg) and a can of rockstar has twice that (160mg) I would say you're off base. Especially since both come in sugar free versions (which I used to enjoy more than the HFCS laden stuff, before I quit).