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If you’re a Wawa devotee who swears by the convenience chain’s hoagies and coffee, brace yourself: another chain just blew past it in a recent customer satisfaction ranking. Dunnhumby released the results of its Convenience Retailer Preference Index (RPI) study, which surveyed more than 10,500 convenience store shoppers across the U.S. The study examined 41 of the nation’s largest convenience…