how much caffeine is in starbucks coffee?
Researchers from Labdoor looked at the caffeine content in a medium cup of brewed coffee from Starbucks, 7-Eleven, McDonald's and Dunkin' Donuts from stores in both New York and San Francisco. According to a Buzzfeed article, the researchers found that 7-Eleven had the highest average amount of caffeine per cup, at 280 milligrams of caffeine per cup.