The BYD M6 should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2026 530km Extended: 4710 mm; 2026 420km Standard: 4710 mm; 2025 530km Extended: 4710 mm; 2025 420km Standard: 4710 mm; 2026 530km Extended: 1810 mm; 15 more variants. Wheelbase and seating matter most day to day because they influence rear-seat comfort, child-seat friendliness and how relaxed the car feels on longer trips.