Buick Regal (2017) is 416 mm (16.38 inch) longer, 117 mm (4.61 inch) wider, 3 mm (0.12 inch) higher and has 17 liters (0.60 ft3) bigger cargo space than Subaru Impreza GP (2015).
Subaru Impreza GP (2015) is 280 kg (617 lbs) lighter than Buick Regal (2017).