If you are wondering whether Marathon Petroleum at US$249.09 is offering value or already reflects a lot of optimism, this breakdown can help you think about what the current share price might be implying. The stock has returned 1.3% over the past week, 10.6% over the past month, 50.8% year to date, and 55.6% over the last year. These gains naturally raise questions about how much of the story is already reflected in the price. Recent coverage of large U.S. refiners, including Marathon...