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The average price of U.S. retail diesel fuel rose last week for the first time in more than three months, inching up 2.3 cents a gallon to $2.314, the Department of Energy reported.

A top U.S. Environmental Protection Agency official said last week that the agency has “absolutely no intention” of granting the request by truck and engine manufacturer Navistar Inc. for a two-year delay in implementing 2010 federal diesel emission standards for new heavy trucks.

The Bloomington, Minn., School District closed all of its schools Thursday because biodiesel fuel gelled and clogged in the district's buses, the Minneapolis-St. Paul Star-Tribune reported.

Consumer prices fell 0.7% in December led by declining energy costs and slowing the declines of previous months, the Labor Department said Friday.

U.S. Environmental Protection Agency Administrator-designate Lisa Jackson said she was “open to discussion” of a carbon tax to limit greenhouse gas emissions and would immediately begin a review of the Bush administration’s denial of California’s request to regulate those emissions from automobiles.

The Environmental Protection Agency, as proposed, has formally required new heavy trucks to have warning lights that indicate when engine emission controls are malfunctioning or deteriorating, starting in 2010.

The U.S. retail diesel average declined 3.6 cents to $2.291 a gallon last week, the 14th consecutive drop, but analysts warned that fleets’ fuel costs are poised to start rising again.