Tesoro receives an uninspiring 44% proportion of "buy" ratings and Valero garners 50%. Tesoro beat analysts' adjusted first-quarter earnings estimate by an impressive 16%, but its stock fell 2.5% in reaction. Valero, on the other hand, missed by 38%, but its shares dropped just 3.7% following the release. Morningstar, which awards Valero three stars out of five and Tesoro two stars, is wary of the companies. Both realized gross margins widened during the quarter as their refining throughput margins nearly doubled, on a per barrel basis. Also, both benefitted from strategic cost cuts commenced during the recession, when losses piled up. Morningstar is cautious on these independent refiners as they are subject to demand destruction at currently high gasoline prices, and a still-below-trend recovery may signal that demand growth will taper, especially in light of a recent uptick in the unemployment rate. Furthermore, the rising political will of environmentalists may threaten the companies in coming years, especially considering the modest taxes imposed on U.S. gas sales. Add sizable debt loads and you have yet another reason to be cautious about refiner stocks. Morningstar values Tesoro at $18, suggesting 28% downside, and Valero at $26, implying a more modest correction of 3%. Describing both firms as having "no economic moat" and "high uncertainty" pertaining to the businesses' long-run viability, Morningstar is advising individual investors to find safer pastures. Given the recent run in these stocks and the potential for a pick-up in the commodity downdraft, profit taking may still be the best, and safest, option for individual stockholders.