Listen to the article (2 minutes) US consumer inflation hit a four-decade high in May as rising energy and food costs pushed prices higher, with little indication of when the uptrend could ease. The Labor Department said Friday that the consumer price index rose 8.6 percent in May from a year earlier, its fastest pace since December 1981. It was also higher than its CPI metric. April, which was slightly below the previous 40-year high reached in March. The CPI measures what consumers pay for goods and services.