BMW 6 Series Gran Coupe (2018) is 643 mm (25.31 inch) longer, 175 mm (6.89 inch) wider and has 72 liters (2.54 ft3) bigger cargo space than Kia Rio (Sedan) (2015).
Kia Rio (Sedan) (2015) is 63 mm (2.48 inch) higher and 808 kg (1,781 lbs) lighter than BMW 6 Series Gran Coupe (2018).
