CNNMoney | Big Oil deal creates largest American refinery CNNMoney Global oil demand grew during the first three months of 2018 by the most in nearly eight years, according to Goldman Sachs. "The state of refining in the United States is very healthy," said Matt Smith, director of commodity research at ClipperData ... Marathon Petroleum to Buy Andeavor in Biggest Oil Refining Deal Texas Billionaire Cashes In As Marathon Grabs Andeavor To Become Biggest US Oil Refiner Ohio-based Marathon Petroleum to buy Andeavor in $23.3 billion oil-refining deal |