Which Soda Has the Most Caffeine?

Pepsi One has 55.5 milligrams of caffeine in 12 ounces, edging out Mountain Dew, which has 55 milligrams in a 12-ounce serving. Some other sodas with high amounts of caffeine include Kick Citrus with 54 milligrams of caffeine, Mellow Yellow with 52.8 milligrams and Tab with 46.8 milligrams.

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