Here are the core statistics -- (Shows 2 P-51 versions). Notice that there is something really wrong with the speed of the P-51 in game. It should out perform the FW and the Spitfire overall...
P-51D Mustang
Performance
• Maximum speed: 437 mph (703 km/h) at 25,000 ft (7,620 m)
• Cruise speed: 362 mph (580 km/h)
• Stall speed: 100 mph (160 km/h)
• Range: 1,650 mi (2,755 km) with external tanks
• Service ceiling: 41,900 ft (12,770 m)
• Rate of climb: 3,200 ft/min (16.3 m/s)
• Wing loading: 39 lb/ft² (192 kg/m²)
• Power/mass: 0.18 hp/lb (300 W/kg)
• Lift-to-drag ratio: 14.6
• Recommended Mach limit 0.8
P-51H Mustang
Performance
• Maximum speed: 487 mph (784 km/h) at 25,000 ft (7,620 m)
• Range: 1,160 mi (1,865 km) with external tanks
• Service ceiling: 41,600 ft (12,680 m)
• Rate of climb: 3,300 ft/min (16.8 m/s)
• Wing loading: 40.4 lb/ft² (197.4 kg/m²)
• Power/mass: 0.23 hp/lb (385 W/kg)
Specifications (Fw 190 A-
Performance
• Maximum speed: 656 km/h at 4,800 m, 685 km/h with boost (383 mph at 19,420 ft (5,920 m), 408 mph (657 km/h) with boost)
• Range: 800 km (500 mi)
• Service ceiling: 11,410 m (37,430 ft)
• Rate of climb: 13 m/s (2,560 ft/min)
• Wing loading: 241 kg/m² (49.4 lb/ft²)
• Power/mass: 0.29-0.33 kW/kg (0.18-0.21 hp/lb)
Specifications (Spitfire Mk Vb)
Performance
• Maximum speed: 378 mph, (330 kn, 605 km/h)
• Combat radius: 410 nmi (470 mi, 760 km)
• Ferry range: 991 nmi (1,140 mi, 1,840 km)
• Service ceiling: 35,000 ft (11,300 m)
• Rate of climb: 2,665 ft/min (13.5 m/s)
• Wing loading: 24.56 lb/ft² (119.91 kg/m²)
• Power/mass: 0.22 hp/lb (0.36 kW/kg)