Chipotle (NYSE: CMG) has been on a tear in 2018, surging over 40% since the start of the year. Of course, the stock had already been down so much, so when new CEO Brian Niccol replaced founder Steve Ells in February, the market took a fresh look at the company, sending the stock up from around $300 per share to over $450 today. Except for one thing: Nothing's really changed in Chipotle's operating results.