The BMW 7 Series PHEV should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2025 750e xDrive M Sport: 5391 mm; 2025 750e xDrive M Sport: 1950 mm; 2025 750e xDrive M Sport: 1544 mm; 2025 750e xDrive M Sport: 3215 mm; 2025 750e xDrive M Sport: 5. 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.