Yahoo Finance -- Dunkin’ Donuts has brewed a Brand Keys “three-peat.” For the third year in a row, Dunkin’ Donuts, America’s all day, every day stop for coffee and baked goods, ranked number one in customer loyalty in the coffee category by the Brand Keys Customer Loyalty Engagement Index. Brand Keys, Inc., a research consultancy considered the world leader in customer loyalty and engagement metrics, conducted the national survey. According to the survey, Dunkin’ Donuts was the leading brand for consistently meeting or exceeding customer expectations.