GM to Add Overtime at Michigan Plant to Boost Gas Pickup Output

General Motors Co. will start operating a Michigan truck plant on Saturdays later this year, adding overtime production to build more of its gas-powered heavy-duty pickups.

The company will run additional hours at its Flint factory starting in June, but doesn’t plan to add more workers, according to a GM spokesman. The plant builds heavy-duty versions of the Chevrolet Silverado and GMC Sierra pickups for commercial businesses and individual customers.

The Detroit automaker is boosting production for some of its thirstiest vehicles even as gasoline prices have climbed to around $4 a gallon nationally since the start of the war ...