Lots of good info out there...this one is interesting. It covers how much caffeine is likely to be in your cup by virtue of a number of factors including brewing method, grind, water temp, brew time, how high the beans are grown...etc. Counter to my previous understanding a pour over system yields one of the highest levels while the French press is on the lower end of the scale.
Anyway, here’s the link: The way you brew your coffee affects the caffeine levels—here's how
Anyway, here’s the link: The way you brew your coffee affects the caffeine levels—here's how