Mazda 3 (Sedan) (2018) is 207 kg (456 lbs) lighter than Opel Insignia Sports Tourer (2014).
Opel Insignia Sports Tourer (2014) is 252 mm (9.92 inch) longer, 60 mm (2.36 inch) wider, 68 mm (2.68 inch) higher and has 141 liters (4.98 ft3) bigger cargo space than Mazda 3 (Sedan) (2018).