Reuters has a “Factbox” today outlining the threat of Hurricane Gustav to U.S. oil in the Gulf of Mexico. Gustav presents the first major threat since Hurricanes Katrina and Rita, which caused oil spillsin 2005. Here are some highlights from Reuters’ highlights of the energy situation: All of U.S. Gulf of Mexico oil output has been shut down; about 95 percent of natural gas output has been shut, and 433,600 Louisiana residents have lost power as a result — 101,500 in evacuated areas, 332,600 in occupied areas.