I'm considering unsweetened tea as a pre-race drink because of low glycemic index and caffeine content. Can't really stomach coffee and de-fizzed coke has too much sugar. Although I wonder if I mix protein powder with Jolt, hmmm . . .
Anyway, the wikipedia entry says tea has about half as much caffeine per cup as coffee but some teas have more caffeine than other teas. Anyone look into this? ie. which tea has most caffeine?
http://en.wikipedia.org/wiki/Caffeine
Tea is another common source of caffeine. Tea usually contains about half as much caffeine per serving as coffee, depending on the strength of the brew. Certain types of tea, such as black and oolong, contain somewhat more caffeine than most other teas. Tea contains small amounts of theobromine and slightly higher levels of theophylline than coffee. Preparation has a significant impact on tea, and color is a very poor indicator of caffeine content.[12] Teas like the green Japanese gyokuro, for example, contain far more caffeine than much darker teas like lapsang souchong, which has very little.