The term 'ULTRA 93 VENDOR' refers to a Sunoco gas station, as the 6-letter solution to the crossword is 'SUNOCO'. Sunoco is an American petroleum and petrochemical manufacturer based in Philadelphia, Pennsylvania. It is one of the largest gasoline distributors in the United States, with over 5, 000 retail outlets in 26 states. Sunoco Ultra 93 is a premium grade gasoline that is designed to provide maximum performance and fuel economy.