To the best of my knowledge, the biggest cup -- more of a bucket, really -- is the 100-ounce size, which you can find at Kum & Go or Bucky's locations.

According to the U.S. Food and Drug Administration, an eight-ounce cup of coffee contains between 80 to 100 milligrams of caffeine. By comparison, a 12-ounce can of soda typically contains 30 to ...