The Mercedes-Benz A-Class should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2025 A 250 4MATIC AMG Line FL: 4549 mm; 2025 A 200 Progressive Line FL: 4549 mm; 2025 A 250 4MATIC AMG Line FL: 1992 mm; 2025 A 200 Progressive Line FL: 1992 mm; 2025 A 250 4MATIC AMG Line FL: 1451 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.