While it's true that a 20 ounce Venti drip coffee has much more caffeine than a 2 ounce espresso shot, it seems unfair to call them both "a serving". It seems

While it's true that a 20 ounce Venti drip coffee has much more caffeine than a 2 ounce espresso shot, it seems unfair to call them both "a serving". It seems unlikely that the person that's going to drink an entire Venti coffee would just drink a single espresso shot. A 12 ounce tall Starbucks coffee has 193mg and a double espresso shot has 150mg. (a tall Americano has 2 espresso shots, so it too has 150mg of caffeine) https://globalassets.starbucks.com/assets/94fbcc2ab1e24359850fa1870fc988bc.pdf https://globalassets.starbucks.com/assets/94fbcc2ab1e2435985... (just in case that link doesn't work, it came from this page: https://www.starbucks.ca/menu/nutrition-info https://www.starbucks.ca/menu/nutrition-info)