Starbucks Tops Coffee-Caffeine Study

Gourmet Coffees Had Higher Caffeine Counts

Starbucks coffee averages 56 percent more caffeine than coffee purchased at gas stations or doughnut shops, according to a study commissioned by The Wall Street Journal.

The Journal hired a laboratory to compare the most widely available ready-made coffees with samples from 7-11 and Dunkin' Donuts nationwide.

The study found that house blends at Starbucks, Gloria Jean's and other gourmet-coffee chains have an average of 56 percent more caffeine than samples from 7-11, and 29 percent more than Dunkin' Donuts.

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