Performance, power and 0-100 km/h
2025 Mercedes-Benz GLS GLS 450 4MATIC has the quicker recorded 0-100 km/h time at 5.9 seconds, compared with 6.2 seconds for 2025 Alfa Romeo Tonale PHEV Q4. 2025 Mercedes-Benz GLS GLS 450 4MATIC has the higher listed output at 362 hp; 2025 Alfa Romeo Tonale PHEV Q4 is rated at 280 hp, a difference of 82 hp. The torque figures follow 2025 Alfa Romeo Tonale PHEV Q4 at 520 Nm and 2025 Mercedes-Benz GLS GLS 450 4MATIC at 500 Nm. These figures describe straight-line potential only; they do not establish braking performance, ride quality, steering response or durability under repeated hard use.
Range, battery, charging and efficiency
Range and energy-use figures are either not shared by both cars or not directly comparable across these powertrain types.
Dimensions, cargo space and towing
2025 Mercedes-Benz GLS GLS 450 4MATIC provides the larger quoted cargo volume: 680 litres versus 422 litres, a difference of 258 litres. 2025 Mercedes-Benz GLS GLS 450 4MATIC carries the higher towing rating at 3,500 kg, while 2025 Alfa Romeo Tonale PHEV Q4 is listed at 1,200 kg. 2025 Mercedes-Benz GLS GLS 450 4MATIC is 679 mm longer overall. Exterior size is not a benefit by itself: a longer body may create useful room, but cargo shape, rear-seat space and ease of parking still require a physical inspection.
Price and overall assessment
2025 Alfa Romeo Tonale PHEV Q4 has the lower listed starting price at $43,500, compared with $88,500 for 2025 Mercedes-Benz GLS GLS 450 4MATIC. 2025 Mercedes-Benz GLS GLS 450 4MATIC leads in more of the shared headline fields, but that is not a universal verdict: a buyer should weight price, performance, range and utility rather than simply count category wins. The assessment is based on the specifications shown here; it is not presented as a two-car road test.