WASHINGTON (Reuters) – U.S. import prices fell for a second straight month in August, weighed down by declining costs for petroleum products and a strong dollar, which overtime could help to lower inflation. Import prices dropped 1.0% last month after declining 1.5% in July, the Labor Department said on Thursday. In the 12 months through August, import prices increased 7.8% after climbing 8.7% in July. Economists polled by Reuters had forecast import prices, which exclude tariffs, falling 1.2% month-on-month. Coming on the heels of data on Wednesday showing a second monthly drop in producer pr…