The national average price for a gallon of diesel bumped up one penny to $3.065, but spot shortages boosted prices in some regions over a dime, according to the Energy Information Administration.

Double-digit increases were noted in the West Coast and Rocky Mountain regions, up 10.5 and 10.3 cents, respectively, to $3.218 and $3.311. For the second week in a row, the Rocky Mountain earned the dubious honor of being the most expensive place to fill up.

Last week BP announced it has shut down a major Alaskan oil field, which crimped supplies in the Northwest. Shortages were noted in the isolated Rocky Mountain region, thanks in part to the transition to ultra-low sulfur diesel. See ULSD unphased by Alaskan oil stoppage or ULSD fires up prices in the Rockies

The biggest drop in prices was in the Lower Atlantic region, down 2.5 cents to $2.964. That region also saw the lowest prices in the nation.