The American Petroleum Institute (API) reported a surprise build in crude oil inventory of 6.81 million barrels for the week ending April 26, coming in over analyst expectations of a 2.093-million-barrel buildup in inventories. Last week, the API reported a large build in crude oil of 6.86 million barrels. A day later, the EIA confirmed the build with a report of a 5.5-million-barrel drop in inventory. Including this week’s data, the net build is now 18.11 million barrels for the 18-week reporting period so far this year, using API…