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The selective catalytic reduction process that most engine manufacturers will use to comply with 2010 federal diesel emission standards could emit toxic byproducts, the California Air Resources Board’s top researcher wrote in a recent letter filed in federal court by Navistar Inc.

Soft drink and snack food maker PepsiCo Inc. said it will reacquire two bottling companies it spun off 10 years ago, spending $7.8 billion in cash and stock to create the largest private fleet in the United States and Canada, in an effort to make its supply chains more efficient.

WASHINGTON — Transportation Secretary Ray LaHood an-nounced last week he will take steps to try to further curb distracting driving activities such as text messaging or using a cell phone or a Global Positioning System device.

U.S. retail fuel prices continued to rise last week, as the average cost of a gallon of diesel climbed 2.2 cents to $2.55 a gallon, while gasoline jumped 5.4 cents to $2.557, the second straight week of increases, the Department of Energy reported.

The U.S. Postal Service said that it lost $2.4 billion in its fiscal third quarter as mail volume continued to plummet.

Initial jobless claims fell by 38,000 last week, the Labor Department said Thursday.

Trailer manufacturer Wabash National Corp. lost $17.9 million, or 59 cents a share, in the second quarter, compared with a loss of $3.2 million, or 11 cents, a year ago.

U.S. factory orders rose in June a third straight month, the Commerce Department said Wednesday.