The Oils-Energy group has plenty of great stocks, but investors should always be looking for companies that are outperforming their peers. Diamondback Energy (FANG) is a stock that can certainly grab the attention of many investors, but do its recent returns compare favorably to the sector as a whole? By taking a look at the stock's year-to-date performance in comparison to its Oils-Energy peers, we might be able to answer that question. Diamondback Energy is one of 249 companies in the Oils-Energy group. T ...