Nissan Altima (2017) is 22 mm (0.87 inch) longer and 210 kg (463 lbs) lighter than Opel Insignia (2015).
Opel Insignia (2015) is 255 mm (10.04 inch) wider, 27 mm (1.06 inch) higher and has 104 liters (3.67 ft3) bigger cargo space than Nissan Altima (2017).
