Performance, power and 0-100 km/h
2026 BMW M3 Competition xDrive has the quicker recorded 0-100 km/h time at 3.4 seconds, compared with 5.8 seconds for 2025 Audi A6 45 TFSI quattro. 2026 BMW M3 Competition xDrive has the higher listed output at 530 hp; 2025 Audi A6 45 TFSI quattro is rated at 265 hp, a difference of 265 hp. The torque figures follow 2026 BMW M3 Competition xDrive at 650 Nm and 2025 Audi A6 45 TFSI quattro at 370 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 Audi A6 45 TFSI quattro provides the larger quoted cargo volume: 530 litres versus 480 litres, a difference of 50 litres. 2025 Audi A6 45 TFSI quattro is 145 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 Audi A6 45 TFSI quattro has the lower listed starting price at $57,500, compared with $80,900 for 2026 BMW M3 Competition xDrive. The measured categories split evenly, so the better choice depends on which attributes matter most. The assessment is based on the specifications shown here; it is not presented as a two-car road test.