Crude oil futures fell for a fourth straight day, pounded by continued worries over euro-zone sovereign debt, the pace of U.S. economic recovery and swelling petroleum stockpiles. Light, sweet crude oil for June delivery on the New York Mercantile Exchange settled down $2 a barrel at $75.11, the lowest level since Feb. 12. In a four-day rout that also hammered equities and currency markets, crude shed $11.08 a barrel, or 12.9%.