BMW 3 Series Touring (2017) is 106 kg (234 lbs) lighter than BMW 7 Series (2018).
BMW 7 Series (2018) is 455 mm (17.91 inch) longer, 91 mm (3.58 inch) wider, 49 mm (1.93 inch) higher and has 19 liters (0.67 ft3) bigger cargo space than BMW 3 Series Touring (2017).