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McDonald's may be the world's biggest fast-food restaurant chain, but new research claims its customers aren't very loyal. Market Force surveyed over 5,000 North American consumers on their fast food and found that McDonald's ranked dead last in terms of customer loyalty. Chick-fil-A was number one in customer loyalty, followed close behind by West Coast fast food pillar In-N-Out. Papa Murphy's, Jersey Mike's, and Raising Cane's rounded out the loyalty top five, respectively.