I'd be interested to know what the controls were for those studies. Were the participants already addicted or was the 30mg+ dosing done on non-addicted people? It's a lot of studies to pour through.

Also, that is a lot of metrics!

And it seems that the athletic performance increase to get statistical validation (for any person) is in the grams range. I ... I just can't see any reason to take that much caffeine unless I'm at the Olympics. I'd be jumping out of my skin!