BMW M340i xDrive Touring G20 vs BMW 540i G30: which is truly faster?

Off the line, the M340i xDrive Touring hits 100 km/h in 4.58 s versus 5.06 s for the 540i. At this point, the M340i xDrive Touring leads by 0.48 s and sits roughly 10 m ahead.

At 200 metres, the M340i xDrive Touring is doing 145 km/h against 143 km/h for the 540i. The gap is 0.42 s. The gap remains stable from the start.

At 400 metres standing start, the M340i xDrive Touring crosses the line in 12.74 s versus 13.21 s. The 0.47 s gap represents roughly 23 m of track - two to three car lengths.

Past 400 metres, the M340i xDrive Touring continues to build its lead. At 600 metres, it runs at 203 km/h versus 200 km/h. At 1,000 metres, the M340i xDrive Touring finishes in 23.11 s versus 23.70 s, with a 0.59 s lead. Both vehicles have similar top speeds (250 (i.e. 155 mph - industry threshold) vs 250 (i.e. 155 mph - industry threshold) km/h), preventing any comeback.

The M340i xDrive Touring features all-wheel drive (AWD) against the 540i’s RWD. At low speeds (0-30, 0-50, 0-80 km/h), AWD doubles the driven contact area: all four wheels transmit torque to the road, virtually eliminating wheelspin at launch. This traction advantage is decisive in the range where the motor delivers peak torque, before power and aerodynamics take over.

Both rivals share the same electronic speed cap: the M340i xDrive Touring and the 540i are governed to 250 (i.e. 155 mph - industry threshold) km/h. At that speed, standard-fit tyres approach their safety threshold - an industrial ceiling common to most electric vehicles in this segment. Neither car shows its true aerodynamic potential in this duel.

With two combustion powertrains, the difference comes down to power-to-weight ratio (4.73 kg/hp vs 4.69 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 7.48 seconds. The 0.48 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.