The BYD Dolphin should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2026 490km Premium Extended: 4290 mm; 2026 410km Dynamic Standard: 4290 mm; 2025 490km Premium Extended: 4290 mm; 2025 410km Dynamic Standard: 4290 mm; 2026 490km Premium Extended: 1770 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.