Porsche Cayman (2015) is 443 kg (977 lbs) lighter than Toyota Mirai (2019).
Toyota Mirai (2019) is 512 mm (20.16 inch) longer, 16 mm (0.63 inch) wider, 244 mm (9.61 inch) higher and has 203 liters (7.17 ft3) bigger cargo space than Porsche Cayman (2015).
