Exxon-Mobil plans to sell off its gasoline retailing business. There is little profit, expenses are high, competition is strong (Wal-Mart, etc.). Old news.
Some 800 wholly owned stations, 1400 more leased to dealers, will be sold. Most stations are in CA, NY, and concentrations in TX, FL, MD, TN and VA.

In many areas, oil companies sell to retailers that have best access to products from their refineries. In Calgary, e. g., Shell service stations sell gasoline from the Imperial Oil (subsidiary of Exxon-Mobil) refinery in Alberta, because it is cheaper and easier of access than product from its own refineries. The same is true of other retailers with various names, and it is true for many areas in the U. S. as well.
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Anyone who expects any serious "greening" before 2030 is dreaming.
Not until then or later will nuclear plants, wind farms, fuel cells, solar collecting farms, etc. be completed and infrastructure for distribution or use be anywhere near effective.

Most efforts towards "greening" must be international, and I see little likelihood of China, India, Canada and others with large coal supplies to fuel electrical energy and/or access to oil agreeing to abandon cheap (yes, it is cheap compared with viable alternatives) energy.