This week the price at the pump for a gallon of diesel or a gallon of gasoline decreased marginally from last week.

Although the average price of a gallon of diesel fell nationally, it was by less than 1 cent, according to the U.S. Energy Information Administration's weekly report. Specifically, diesel fell by 0.7 cents to land at an average of $4.08 per gallon.

Although the price of diesel has been falling the past few weeks, the price per gallon is still on average 33 cents above where it was one year ago.

Prices remain highest on the West Coast, which saw a slightly larger decrease at 2.2 cents per gallon. The price for a gallon of diesel on the West Coast is an average of $4.30. The highest prices are seen in California with a gallon of diesel costing on average $4.38.

The price for a gallon of gasoline also fell this week, on average 2.2 cents per gallon nationally to rest at $3.80.

Benchmark crude oil rose 29 cents on Monday to close at $92.48 per barrel, as investors took heart in a report showing U.S. manufacturing activity rose in September for the first time in four months.