Diesel continued its downward trend this week, slipping 1.9 cents to a national average of $2.938 a gallon

, according to weekly figures released by the U.S. Energy Information Administration. This is the fuel's third consecutive weekly drop.

Over the last few weeks, diesel has fallen 5.3 cents. Prior to the declines, diesel climbed a total of 9.2 cents in three weeks. This week's average is 26.4 cents higher than the same week last year.

Diesel still stayed above $3 a barrel in a few regions of the U.S., including the West Coast and Central Atlantic regions. They had the highest averages at $3.101 and $3.02 a gallon, respectively. The cheapest diesel can be found in the Lower Atlantic and Gulf Coast, with averages of $2.886 and $2.888 a gallon, respectively.

Meanwhile, as July personal incomes figures were released Monday, investors grew even more concerned that the economy is not recovering as it should, Bloomberg reports. This sent crude oil futures down for the first time in four days, according to the news service. A strengthening dollar against the euro also contributed to lower crude prices.

Crude oil was down 0.6 percent to $74.70 a barrel on the New York Mercantile Exchange, Bloomberg reports.