Diesel prices dropped in most regions this past week. The national average price for a gallon of diesel slipped 0.7 cents to $4.03, which is still almost about a dime more than last year's prices at this time.

The Energy Information Administration reported prices in the Rocky Mountain region experienced the sharpest decline with diesel falling 6.8 cents per gallon to $3.99. Prices on the East Coast and Lower Atlantic increased marginally by 0.4 cents.

People paid the most for diesel on the East Coast in the New England area, where the after affects of Hurricane Sandy are still being felt. There, a gallon of diesel costs on average $4.22.

Gasoline prices experienced a slightly bigger drop on average than did diesel. Nationwide, gasoline prices fell 4.3 cents per gallon to $3.39. As with diesel prices, the most expensive gasoline prices are found on the East and West Coasts.

On Monday, as worries regarding the ongoing fiscal cliff negotiations continued to weigh on investors, prices for oil for January delivery rose 18 cents per barrel to land at $89.09.