Historical clue formulations

• Gas brand — 2024-09-29
• Gas giant — 2019-11-07
• Company once named Socony-Vacuum — 2017-06-02
• Exxon merger partner — 2014-09-08
• Brand paired with On the Run convenience stores — 2014-05-03
• Pegasus appeared in this company's logo — 2011-01-13
• Exxon merged with it — 2010-06-28
• 1999 Exxon merger partner — 2009-10-21
• Shell alternative — 2009-10-10
• Oil company in a 1999 merger — 2007-11-18
• It merged with Exxon — 2007-06-05
• Big gas brand — 2003-01-07
• Shell alternative — 2002-01-13
• Shell competitor — 2000-02-20
• Company whose logo has a red "o" — 1999-04-08
• Shell competitor — 1997-03-12
• Shell rival — 1996-07-21