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Prior to its acquisition by Marathon Petroleum on October 1, 2018, Andeavor (previously known as Tesoro Corporation) was a Fortune 100 and a Fortune Global 500 company headquartered in San Antonio, Texas, with 2017 annual revenues of $35 billion, and over 14,000 employees worldwide. Andeavor was an independent refiner and marketer of petroleum products, operating ten refineries in the Western United States with a combined rated crude oil capacity of approximately 1,200,000 barrels (190,000 m3) per day. Andeavor's retail-marketing system included approx.
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