For the first time in 10 weeks, weekly retail on-highway diesel prices declined. According to figures released by the Energy Department Oct. 28, the national average cost of diesel dipped to $1.456 this week from last week's high of $1.469.

The highest prices nationally are in California, where the price this week is $1.549. The lowest average prices this week are in the Lower Atlantic region. Fuel there dropped to $1.407 this week from $1.427 per gallon last week.

Prices declined in all regions of the country, except in New England, where this week's price is $1.496 compared to $1.488 last week.

The remaining regions' price-per-gallon is as follows: East Coast, $1.442; Central Atlantic, $1.513; Midwest, $1.457; Gulf Coast, $1.417; Rocky Mountain, $1.509; and the West Coast, $1.524, 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.