The national average price for a gallon of on-highway diesel was $2.889 for the week ending Monday, July 23, 2007, the same price as the previous week.
The U.S. Energy Information Administration reported that ultra-low sulfur diesel increased one-tenth of a cent to $2.903 while remaining supplies of low-sulfur diesel decreased a half cent from $2.834 to $2.829 per gallon.
The national average for the week was 5.7 cents cheaper than one year ago, the EIA reported.
ULSD prices by region did not fluctuate much for the week.
The largest average increase in price occurred in the West Coast region, where ULSD climbed 3.1 cents from $3.041 to $3.073 per gallon.
California ULSD continued to climb, increasing 1.1 cents from $3.147 to $3.158.
The Rocky Mountain region averaged $2.994 for ULSD, an increase of 1.1 cents, while the Midwest region average increased three-tenths of a cent from $2.896 to $2.899.
The largest decrease occurred in the Lower Atlantic region, where ULSD dropped 1.6 cents from $2.846 to $2.830 per gallon.
ULSD in the Gulf Coast region averaged $2.819, down six-tenths of a cent from $2.825.
The East Coast region also saw an average decrease, as ULSD dropped 1.1 cents per gallon from $2.888 to $2.877.
The New England region averaged $2.950 for ULSD, down nine-tenths of a cent from the previous week.
ULSD in the Central Atlantic region decreased four-tenths of a cent from $2.945 to $2.941 per gallon.