How many stored does the American fast food restaurant franchise that sponsored Subway 400 have? 
Subway 400:  This 400-mile (644 km) annual race was sponsored by Subway and was held at North Carolina Speedway ("The Rock") since 1966. Subway (restaurant): Subway is a privately held American fast food restaurant franchise that primarily sells submarine sandwiches (subs) and salads. Subway is one of the fastest-growing franchises in the world and, as of June 2017, has approximately 45,000 stores located in more than 100 countries.
45,000