Buick Regal (2014) 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 (2015).
Subaru Impreza GP (2015) is 270 kg (595 lbs) lighter than Buick Regal (2014).