Loyal customers of Buc-ee’s have made the store a fan favorite, but the nonprofit Better Business Bureau tells another story, recently slapping the popular Texas-based mega gas station chain with an “F” rating. Buc-ee’s is known for the sheer size of its convenience stores (a Luling, Texas, outpost spans 75,593 square feet) and numerous gas pumps (more than 100 at some locations), along with clean, private bathrooms and barbecue brisket sandwiches. In fact, Buc-ee’s, which has...