Historical clue formulations

• Company descended from the Rockefeller oil empire — 2024-07-20
• Competitor of BP — 2017-03-08
• Shell alternative — 2011-07-24
• Half of a giant 1999 merger — 2010-04-21
• BP competitor — 2009-04-02
• Replacer of the Humble brand in the early 1970s — 2008-04-26
• It merged with Mobil — 2007-05-16
• Speedpass-accepting gas company — 2007-04-24
• 1-Across competitor — 2004-04-22
• BP competitor — 2003-07-10
• Corporate giant based in Irving, Tex. — 1997-08-09