Audi A3 (Sedan) (2015) is 405 kg (893 lbs) lighter than BMW 5 Series (2017).
BMW 5 Series (2017) is 487 mm (19.17 inch) longer, 71 mm (2.80 inch) wider, 83 mm (3.27 inch) higher and has 144 liters (5.09 ft3) bigger cargo space than Audi A3 (Sedan) (2015).
