BMW M140i xDrive F20LCI vs MG4 Long Range RWD: which is truly faster?

Off the line, the M140i xDrive hits 100 km/h in 4.43 s versus 6.73 s for the 4 Long Range RWD. Despite lacking instant torque, 340 hp of power compensates. At this point, the M140i xDrive leads by 2.30 s and sits roughly 24 m ahead.

At 200 metres, the M140i xDrive is doing 147 km/h against 129 km/h for the 4 Long Range RWD. The gap is 1.66 s. The challenger starts to claw back ground.

At 400 metres standing start, the M140i xDrive crosses the line in 12.64 s versus 14.92 s. The 2.27 s gap represents roughly 96 m of track - a gap visible to the naked eye.

Past 400 metres, the M140i xDrive continues to build its lead. At 600 metres, it runs at 203 km/h versus 176 km/h. At 1,000 metres, the M140i xDrive finishes in 23.01 s versus 27.23 s, with a 4.22 s lead.

The M140i xDrive features all-wheel drive (AWD) against the 4 Long Range RWD’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 are electronically governed, but not at the same level: the M140i xDrive is capped at 250 (i.e. 155 mph - industry threshold) km/h, the 4 Long Range RWD at 180 km/h. This isn’t a physical engine limit - it’s a manufacturer choice, usually for tyre safety or homologation reasons. Neither car reaches its true aerodynamic top speed.

Instant electric torque gives an advantage off the line. The higher top speed of the combustion engine gives an advantage over longer distances. The distance at which one catches the other depends on the top speed differential.

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 10.07 seconds. The 2.30 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.