Most people don't realize this, but McDonald's coffee is fairly weak compared to other places you can go. Starbucks coffee has more than TWICE as much caffeine per ounce. Even 7-Eleven coffee has significantly more.

Here are six coffees ranked by how much caffeine each one is packing:

  1.   Starbucks, 20.6 milligrams per ounce. To compare, Pepsi only has about 3 milligrams per ounce.
  2. 7-Eleven coffee, 17.5 milligrams.
  3. Dunkin' Donuts coffee, 15 milligrams.
  4. Chick-fil-A coffee... yes, they have coffee,13.6 milligrams.
  5. Panera Bread, 11.8 milligrams per ounce.
  6. McDonald's coffee, just 9.1 milligrams.

Read more at Food Beast