Marathon Petroleum (MPC) has recently been on Zacks.com's list of the most searched stocks. Therefore, you might want to consider some of the key factors that could influence the stock's performance in the near future. Over the past month, shares of this refiner have returned -1.4%, compared to the Zacks S&P 500 composite's +4.3% change. During this period, the Zacks Oil and Gas - Refining and Marketing industry, which Marathon Petroleum falls in, has lost 3.2%. The key question now is: What could be the st ...