Do you drink coffee for the jolt of caffeine it offers? Buzzfeed lab tested coffee from four national chains-- Starbucks, McDonald's, 7-Eleven, and Dunkin' Donuts-- to determine which packs the most caffeine. They found 7-Eleven coffee had the highest average caffeine level, with an average of 280 milligrams of caffeine in every cup. Starbucks came in second with an average of 267 milligrams, McDonald's McCafe had 227 milligrams, and Dunkin' Donuts came in last with 220 milligrams per cup. Researcher Dan Mark sums up the findings, saying, "Statistically, they're all kind of overlapping. If you go to any one of these single chains and grab a medium cup of coffee you can expect around 250 milligrams of caffeine."
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