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Driver turnover at large truckload carriers reached 106% in the second quarter — the highest level since the final quarter of 2007 — as fleets looked for staff to move modestly higher freight volumes this year, American Trucking Associations reported.

NEW YORK — Aging fleet owners, struggling small carriers and the never-ending search for enough qualified drivers are combining to heat up the trucking acquisition market this year, according to industry executives and experts.

COLUMBUS, Ind. — Trucking’s experiment with natural gas engines continues to expand, as another major truckload fleet said it was testing the fuel, and a medium-size fleet already reported significantly favorable results in regional and local shipping.

Retail diesel prices in the United States rose 0.5 cent to $4.132 a gallon last week, the Department of Energy reported, for its 10th straight gain.

Werner Enterprises said its third-quarter earnings will be between $24.2 million and $26.4 million, lagging behind estimates.

Consumer confidence rose in September, according to the Thomson Reuters/University of Michigan consumer sentiment index released Friday.

Business inventories rose 0.8% in July, the biggest increase in six months, the Commerce Department said Friday.

Industrial production declined by 1.2% in August, the biggest drop since March 2009, the Federal Reserve said Friday.

Retail sales increased 0.9% in August, the Commerce Department said Friday.