Murphy USA announced Monday an agreement to acquire QuickChek Corporation in an all-cash transaction for $645 million. The purchase price includes expected tax benefits valued at $20 million for a net after-tax purchase price of $625 million. The transaction will be financed with a combination of cash on hand, existing credit facilities and new debt, and El Dorado-based Murphy USA has obtained committed financing from the Royal Bank of Canada. A statement from Murphy USA said that QuickChek represents a truly distinctive business in a class shared by only a few comparable industry peers. Founded in 1967 as an extension of Durling Farms, a door-to-door milk and fresh dairy products delivery service that originally opened in 1888, it is a family-owned chain of 157 stores located in central and northern New Jersey and the New York metro area.