Murphy USA (MUSA) is set to release first-quarter results on May 1. The current Zacks Consensus Estimate for the to-be-reported quarter is a profit of $4.09 per share on revenues of $4.9 billion.Let’s delve into the factors that might have influenced the downstream operator’s results in the March quarter. But it’s worth taking a look at MUSA’s previous-quarter performance first.Highlights of Q4 Earnings & Surprise HistoryIn the last reported quarter, the El Dorado, AR-based motor fuel retailer beat the cons ...