I just did research on caffeine in tea, and the results are all over the place. One brand of Earl Grey can have twice as much caffeine as the other. Even then,

I just did research on caffeine in tea, and the results are all over the place. One brand of Earl Grey can have twice as much caffeine as the other. Even then, 50 is the upper bound if you seep the tea for 5 minutes, and it's still much less than coffee.