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Another fun fact: a shot of espresso generally has slightly less caffeine than a regular cup of coffee.

Not sure why, but I'd always assumed a shot of espresso was like a concentrated giant cup of regular roast. However, a regular sized cup of espresso is a different story...

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I could be just a matter of volume. The volume ratio is greater than the concentration ratio. You can say the same thing about espresso vs. soda -- drinking a shot of espresso will probably result in less caffeine than downing a large soda bottle. For example 1oz a espresso would have about 70mg of caffeine, which is less than 20oz of Diet Coke (80mg of caffeine).

I read that that is because the longer the roast the more caffeine gets destroyed.

So stronger coffees are actually less buzzy.

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