Ah, your morning cup of Joe. You need that caffeine to survive the long work day, get through a brutal Friday morning hangover and just not be a complete grump to everyone around you.

But how much caffeine is really in your coffee? According to a new study from the Center for Science in the Public Interest, not as much as you might think. With the help of EnergyFiend.com, the Center measured the milligrams of caffeine per ounce of coffee from various chains across the nation.

After checking out the chart above, Bostonians will be disappointed to know that their morning Dunkies aren’t as turbo-loaded as they thought. Then again, maybe we were fully aware that those large iced coffees were all sugar water anyway.

[h/t Huffington Post]