Buick Regal (2015) is 416 mm (16.38 inch) longer, 117 mm (4.61 inch) wider, 13 mm (0.51 inch) higher and has 17 liters (0.60 ft3) bigger cargo space than Subaru Impreza GP (2016).
Subaru Impreza GP (2016) is 280 kg (617 lbs) lighter than Buick Regal (2015).