Related Clues:

• Piano-playing Dame
• Shell competitor
• See 1-Across
• Spandau's last prisoner
• 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
• Big name in oil
• Jersey Standard's other name
• Pianist Myra
• It's a gas
• Bygone U.S. gas brand