BMW 3 Series (2015) is 332 mm (13.07 inch) longer, 30 mm (1.18 inch) wider and has 139 liters (4.91 ft3) bigger cargo space than Mercedes A-Class (2016).
Mercedes A-Class (2016) is 4 mm (0.16 inch) higher and 170 kg (375 lbs) lighter than BMW 3 Series (2015).
