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GM Vehicles Investigated by U.S. Regulators on Fuel Readings

General Motors Co. trucks are being investigated by U.S. auto-safety regulators because faulty fuel-tank readings may lead drivers to think there’s more gasoline in the vehicles than there really is.

The U.S. National Highway Traffic Safety Administration said today on its website it is probing about 865,000 Chevrolet, GMC, Buick and Saab vehicles. The agency said it received 668 complaints, including 610 that didn’t result in stalling, and one report of a crash attributed to the defect.