By Nicole Jao and Pooja Menon Refining segment adjusted operating earnings more than triple to $4.4 billion Valero returns $2.6 billion to shareholders in second quarter Average throughput increased to 3 million bpd from 2.9 million a year earlier NEW YORK, July 30 (Reuters) – Valero Energy (VLO.N), opens new tab on Thursday reported its … Read more