The average price of a gallon of diesel fuel nationwide fell for the second straight week, dropping 2.2 cents to $2.957 a gallon, according to US Department of Energy information.
The two declines followed three weeks of increases, and the most recent price was 28.9 cents higher than the same week in 2009.
All regions reported lower prices except the Rocky Mountain area, where the price rose less than a penny. The Lower Atlantic fell 3 cents as part of a 2.5-cent average decrease on the East Coast. The Midwest region dropped 2.6 cents to $2.927. California retained its position as the most expensive in the United States at $3.171 a gallon.