Hyundai i30 (2015) is 15 mm (0.59 inch) higher, 30 kg (66 lbs) lighter and has 14 liters (0.49 ft3) bigger cargo space than Mazda 3 (Hatchback) (2014).
Mazda 3 (Hatchback) (2014) is 160 mm (6.30 inch) longer and 16 mm (0.63 inch) wider than Hyundai i30 (2015).