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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.

President Bush outlined an energy plan Tuesday that would boost the use of alternate fuels such as ethanol and biodiesel, and would seek a 20% reduction in gasoline use in the next 10 years, news services reported.

The average price of retail diesel fuel fell 3.3 cents to $2.43 a gallon, the Department of Energy said Monday.

The average national retail price of diesel fuel fell 7.4 cents to $2.463 a gallon, the Department of Energy reported Tuesday.

Ford Motor Co. sued Navistar International Corp., the supplier of diesel engines for one of the automaker's most important models, in a contract dispute over warranty costs and engine prices, Bloomberg reported.

Trucking component maker ArvinMeritor and Wal-Mart Transportation have agreed to develop a dual-mode, diesel-electric drivetrain for a Class 8 tractor, the two said.

The average retail price of diesel fuel dropped 4.3 cents to $2.537 a gallon, the Department of Energy reported Monday.

Manufacturers of new heavy-duty engines designed to meet Environmental Protection Agency emission regulations that went into effect Jan. 1 said EPA has certified all engine models submitted for approval.