> The government stated that the syrup, when diluted as directed, would result in a beverage containing 1.21 grains (or 78.4 mg) of caffeine per 8oz serving

> Coca-Cola then voluntarily reduced the amount of caffeine in its product

That's interesting. 8 fl oz is 236ml, roughly the same size as a regular Red Bull can at 250ml which contains 80mg caffeine.

Caffeine mg per ml -

Monster Energy: 0.34

pre-1912, post-cocaine Coke: 0.33

Red Bull: 0.32

Modern Diet Coke: 0.12

Modern Coke: 0.09

People must have been pretty amped in the early 1900s.