Related Clues:

• Shell competitor
• U.S. brand retired in 1972
• Sinclair rival
• Where an Edsel filled up, maybe
• Socony rival
• Old Shell rival
• This put a tiger in your tank
• Jersey Standard's other name
• It's a gas
• Bygone U.S. gas brand
• Old gas brand
• Exxon predecessor
• Big name in petroleum
• Shell alternative
• Exxon, once