Toyota Mirai (2020) is 494 mm (19.45 inch) longer and 140 mm (5.51 inch) wider than Toyota Prius Prime (2017).
Toyota Prius Prime (2017) is 21 mm (0.83 inch) higher, 467 kg (1,030 lbs) lighter and has 92 liters (3.25 ft3) bigger cargo space than Toyota Mirai (2020).
