This makes Gran Turismo far and away Sonys most successful series to date- its more than Uncharted, more than God of War, more than Ratchet and Clank. Sales have no doubt been buoyed by Gran Turismo Sports release last year- while this shouldnt be official, extrapolating Sports numbers from this data, as well as previously known lifetime ales for Gran Turismo, puts its sales at 3.5 to 4 million units worldwide….

Gran Turismo Series Sales At 80.4 Million

Source: PS4 News – Gran Turismo Series Sales At 80.4 Million