Crude oil prices were mixed Tuesday, with the U.S. index rising in response to a storm in the Gulf of Mexico and Brent moving down on supply issues. British energy company BP said operations are normal in the Gulf of Mexico, though others in the region have pulled some staff from the area amid threats from Tropical Storm Bill. The National Hurricane Center in Miami, Fla., said Bill was moving northwest at about 13 miles per hour and was on track to hit the Texas coast by Tuesday morning. The U.S. Energy Information Administration estimates the Gulf of Mexico accounts for about 17 percent of total U.S. […]