 A measure of prices that's closely dragged by the Federal Reserve suggests that inflation pressures in the U.S. economy are continuing to ease. Consumer prices were flat from April to May, the mildest such performance in more than four years. Measured from a year earlier, prices rose 2.6% last month, slightly less than in April. Excluding volatile food and energy prices, so-called core inflation rose 0.1% from April to May.