Valero Energy (VLO) has recently been on Zacks.com's list of the most searched stocks. Therefore, you might want to consider some of the key factors that could influence the stock's performance in the near future.Shares of this oil refiner have returned +16.9% over the past month versus the Zacks S&P 500 composite's +1.8% change. The Zacks Oil and Gas - Refining and Marketing industry, to which Valero Energy belongs, has gained 10.7% over this period. Now the key question is: Where could the stock be headed ...