According to figures released by the U.S. Energy Department Nov. 4, the national average cost of diesel dipped to $1.442 a gallon from last week's average of $1.456.

The highest prices nationally are in California, where the price this week is $1.549, the same as last week's price. The lowest average prices this week were in the Lower Atlantic and the Gulf Coast regions, where the average price is $1.394.

The remaining regions' price-per-gallon is as follows: East Coast, $1.432; Central Atlantic, $1.508; Midwest, $1.441; Rocky Mountain, $1.502; and the West Coast, $1.521, respectively. The Department of Energy reports the average price of self-serve each week. Prices are based on a survey of 350 diesel service centers nationwide and include taxes.