Investors interested in Transportation stocks should always be looking to find the best-performing companies in the group. Has Teekay Tankers (TNK) been one of those stocks this year? By taking a look at the stock's year-to-date performance in comparison to its Transportation peers, we might be able to answer that question.Teekay Tankers is one of 122 companies in the Transportation group. The Transportation group currently sits at #3 within the Zacks Sector Rank. The Zacks Sector Rank includes 16 different ...