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.

According to FoodBeast here are eight coffees ranked by how much caffeine each one is packing . . .

Coffee Bean & Tea Leaf, 20.8 milligrams of caffeine per ounce.  To compare, Pepsi only has about 3 milligrams per ounce.

Starbucks, 20.6 milligrams per ounce.

7-Eleven coffee, 17.5 milligrams.

Peet's Coffee, 16.7 milligrams.

Dunkin' Donuts coffee, 15 milligrams.

Chick-fil-A coffee . . . yes, they have coffee . . . 13.6 milligrams.

Panera Bread, 11.8 milligrams per ounce.

McDonald's coffee, just 9.1 milligrams.