Looking into the current session, Chipotle Mexican Grill Inc. (NYSE:CMG) shares are trading at $55.96, after a 0.74% drop. Over the past month, the stock fell by 3.48%, but over the past year, it actually increased by 34.26%. With questionable short-term performance like this, and great long-term performance, long-term shareholders might want to start looking into the company’s price-to-earnings ratio. Chipotle Mexican Grill P/E Compared to CompetitorsThe P/E ratio is used by long-term shareholders to assess the company’s market performance against aggregate market data, historical earnings, a…