How much caffeine is in your drink?

Ever wondered how much caffeine was in your Starbucks coffee?  Between 6 and 20 mg/oz depending on what type.  Diet Coke has 3.75 mg/oz and Mountain Dew (which has a reputation for having a lot of caffeine) has 4.5 mg/oz.   Myth busted: coffee had more caffeine than Mountain Dew.

Here's the chart with all the info.