U.S. oil refinery utilization rates slumped 16.9 percentage points to 79.7 percent last week, the lowest rate since 2010, according to data released by the U.S. Energy Information Administration on Thursday. U.S. Gulf Coast utilization rates dropped to 63.4 percent, the lowest rates since the EIA began collecting the data in 2010. U.S. refinery crude runs fell 3.3 million barrels per day to 14.5 million bpd in the week to Sept. 1, the lowest amount processed since 2013, EIA data showed. The data reflects the impact of Hurricane Harvey which hit the Gulf Coast on Aug. 25.