The United States aims to buy gasoline in end-July or early August to build emergency stocks to cover the hurricane season, using the $495 million from a strategic oil reserve test sale, the top U.S. energy official said on Tuesday.

U.S. Energy Secretary Ernest Moniz told Reuters in an interview that the first test sale from the nation's Strategic Petroleum Reserve since 1990 "went very well," and that half of the 5 million barrels of crude that was sold has been drawn.