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The average national retail price of diesel fuel rose 1.5 cents to $2.491 a gallon, the Energy Department reported Tuesday.

Sweden-based truck maker Volvo AB has agreed to buy Japan’s Nissan Diesel Motor Co. for $1.1 billion to add production in Asia, Bloomberg reported Tuesday.

ARLINGTON, Va. — American Trucking Associations said last week it would become more vocal in its support for increased fuel efficiency in heavy trucks and ratified an agreement with the biodiesel industry to promote that fuel at the federal level.

The average national price of retail diesel fuel jumped 4.1 cents to $2.476 a gallon, the Department of Energy said Monday.

SAN ANTONIO — Truck-stop industry officials meeting here said their main focus this year would be preparing for the expected increase in biodiesel use.

Click here to write a Letter to the Editor. Undoubtedly, there is a need to pursue alternatives to decrease fuel consumption, lower our dependency on fossil fuels, promote cleaner air and reduce CO2 emissions.

Diesel prices will average $2.59 this year, down from $2.705 last year and 7 cents below an earlier forecast, the Department of Energy said Tuesday.

The average price of retail diesel fuel rose 2.2 cents to $2.435 a gallon, marking the first increase in eight weeks, the Department of Energy said late Monday.

While other carriers were debating whether to buy even one Class 8 truck with a 2007 EPA-certified engine, Mike Hasinec at Penske Truck Leasing Co. was knee-deep in testing 2007 engine performance.

The average retail price of diesel fuel fell 1.7 cents to $2.413 a gallon, the Energy Department reported Monday.