The national average price for a gallon of on-highway diesel was $2.805 for the week ending Monday, June 18. That’s up 1.3 cents from the previous week’s average of $2.792 per gallon, but still 11 cents cheaper than the average price one year ago.
With more and more of the nation’s diesel being refined as ultra-low sulfur diesel, the price disparity between ULSD and low-sulfur diesel supply continues to grow.
Low-sulfur diesel is cheaper on a national scale, averaging $2.748 per gallon despite an increase for the week of 3.2 cents from $2.716.
ULSD, which makes up about 65 percent of the nation’s on-highway diesel, averaged $2.822, up eight-tenths of a cent.
The Energy Information Administration, which breaks down average ULSD prices into nine U.S. regions, reported price increases in six of those regions.
The largest increase was in California, where fuel is once again above the $3 mark. The average price for ULSD was $3.033 for the week, up 3.6 cents from $2.997.
ULSD in the West Coast region was up 1.9 cents from $2.949 to $2.968 per gallon.
The Lower Atlantic region had an average of $2.780 for ULSD, up 1.5 cents from $2.765.
The Gulf Coast region had the cheapest average price in the nation - $2.759 for a gallon of ULSD – despite an increase of seven-tenths of a cent.
ULSD in the Midwest averaged $2.792, up 1.3 cents from $2.779.
The East Coast region rounded out the average increases, as ULSD was up six-tenths of a cent from $2.812 to $2.818.
The biggest decrease in average price happened in the Rocky Mountain region, where a gallon of ULSD dropped 3.1 cents from $2.944 to $2.913.
An average gallon of ULSD cost $2.873 in New England, down seven-tenths of a cent from $2.880.
In the Central Atlantic region, ULSD averaged $2.867, down five-tenths of a cent from $2.872.