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A cup of java is a cup of java. When it comes to caffeine content, that could be another matter entirely.

Data from the Center for Science in the Public Self Interest and the website EnergyFiend.com indicate caffeine content per ounce of coffee can vary widely.

According to a March article in The Huffington Post, coffee from McDonald's could have as little as 9.1 milligrams per fluid ounce. Deathwish brand coffee, however, contains 54.2 milligrams per ounce.

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