BMW 1 Series (2014) is 235 kg (518 lbs) lighter than BMW 3 Series Gran Turismo (2018).
BMW 3 Series Gran Turismo (2018) is 464 mm (18.27 inch) longer, 80 mm (3.15 inch) wider, 97 mm (3.82 inch) higher and has 160 liters (5.65 ft3) bigger cargo space than BMW 1 Series (2014).