According to the website:
Shell is a British multinational oil and gas company that operates a network of gas stations in the US including this one in Knoxville, TN. They offer a variety of unleaded and diesel products, including Shell V-Power NiTRO+ Premium Gasoline and Shell Midgrade Gasoline.
Products and services they offer:
Shell stations also have car washes, ATM cash machines, and convience shops at select locations. Customers can enjoy food and drink offerings like snacks, fountain drinks, coffee, cigarettes, lottery tickets and more.