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The average price of a gallon of diesel fuel dipped 2.5 cents to $3.949, the second straight decline and the largest one-week drop in five months, the Department of Energy reported Sept. 23.

National diesel prices dipped by 0.7 cent a gallon last week to $3.974, on average, the Department of Energy said, leaving trucking’s main fuel about midway between its high and low points for this year.

DETROIT — Daimler Trucks North America announced a pair of significant expansions in its telematics offerings here, unveiling the first factory-installed computer tablet for its trucks and a new communications package to seamlessly provide services over that tablet.

A federal appeals court has upheld a provision in California’s landmark 2007 global warming law requiring the oil industry to reduce the carbon content in diesel and gasoline fuels by at least 10% by 2020.

California legislators have approved a pair of bills that would provide funding to help fleets purchase low-emission trucks and encourage the development and use of alternative-fuel trucks.

New York City Mayor Mike Bloomberg signed into law a measure that mandates the use of biodiesel in all city-owned vehicles.

Trucking rates are expected to rise this fall as capacity tightens on regulatory effects and improved freight demand, according to FTR’s Trucking Conditions Index.

The U.S. retail diesel price average was unchanged at $3.981 a gallon last week, holding steady at a five-month high, while regular gasoline dipped 2.1 cents to $3.587, the Department of Energy reported.