The MINI Cooper BEV should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2026 400km Paul Smith Edition: 3858 mm; 2025 400km SE: 3858 mm; 2026 400km Paul Smith Edition: 1756 mm; 2025 400km SE: 1756 mm; 2026 400km Paul Smith Edition: 1460 mm; 5 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.