Refiners see a better year ahead

06, -0.70, -1.71%) . Prospects for exports to Latin America remain a theme for refiners such as Valero Energy Corp. /quotes/comstock/13*!vlo/quotes/nls/vlo (VLO 23.84, +0.06, +0.25%) ��and Marathon Oil /quotes/comstock/13*!mro/quotes/nls/mro (MRO 38.64,...