Related Clues:

• Onetime distributor of free maps
• Saskatchewan station name
• Exxon's ex-name
• Oil giant of yore
• Sponsor of early radio's 'Five Star Theater'
• Brand name that sounds like two letters of the alphabet
• Mobil relative
• Rival of Phillips 66
• Brand name that's coincidentally Italian for 'it'
• 'Happy Motoring' brand
• Standard Oil, once
• Exxon, in other countries
• Onetime Amoco competitor
• Petrol purveyor
• Canadian gas station sign