The national average retail price of a gallon of diesel increased less than a penny, to $2.160, for the week ending May 30.
Of the eight regions tracked by the U.S. Department of Energy, the average price increased in four and decreased in four. The biggest decrease, nearly 3 cents, was in the Rocky Mountains; the biggest increase, a penny and a half, was in the Lower Atlantic.
On average, diesel was most expensive in New England at $2.320 and least expensive in the Midwest at $2.111.
For state-by-state diesel prices, updated daily, visit http://www.etrucker.com/apps/promiles/fuelprices.asp.