Zacks Industry Outlook Highlights: Valero Energy, HollyFrontier, Murphy USA and Delek US Posted byZacks Equity Research December 23, 2021 Leave a comment on Zacks Industry Outlook Highlights: Valero Energy, HollyFrontier, Murphy USA and Delek US Zacks Industry Outlook Highlights: Valero Energy, HollyFrontier, Murphy USA and Delek US.