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The U.S. retail diesel average slipped 0.7 cent last week to $2.939, ending a string of five consecutive increases, the U.S. Department of Energy reported.

The U.S. retail diesel average increased 2.2 cents to $2.946 a gallon last week for its fifth straight increase, the Department of Energy reported. Diesel now has jumped 19 cents a gallon since Feb. 15, when it was at $2.756.

Congress should include comprehensive funding policies in the upcoming transportation reauthorization bill both to modernize freight transportation and reduce diesel emissions, an environmental group said in a report last week.

The U.S. retail diesel price average rose another 2 cents to a 16-month high of $2.924 a gallon last week, the fourth straight increase, the Department of Energy reported.

Renewable Energy Group has acquired two biodiesel plants, making it North America's largest biodiesel manufacturer, the company said.

The Transportation Department announced last week it will drop some materials, including paint and diesel fuel, from the list of substances the agency considers dangerous enough to require hazmat motor carriers to file detailed security plans.

The average price for retail diesel rose for a third straight week, this time by 4.3 cents to $2.904 a gallon, to the highest level since November 2008, the Department of Energy reported.