FILE- In this Feb. 14, 2019, file photo this is the Ford logo on a 2019 Ford Ranger 2019 Supercrew 4x4 on display at the 2019 Pittsburgh International Auto Show in Pittsburgh. Ford says it has launched an investigation into whether a flawed mathematical model caused it to overstate gas mileage and understate pollution from a wide range of vehicles. The company says a group of employees reported possible problems with the model in September. So it has hired an outside firm to test the 2019 Ford Ranger. (AP Photo/Gene J. Puskar, File)
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