BMW X7 xDrive50i G07 vs BMW X3 M40d G01: which is truly faster?

Off the line, the X3 M40d hits 100 km/h in 4.99 s versus 5.33 s for the X7 xDrive50i. At this point, the X3 M40d leads by 0.34 s and sits roughly 6 m ahead.

At 200 metres, the X3 M40d is doing 137 km/h against 137 km/h for the X7 xDrive50i. The gap is 0.25 s. The gap remains stable from the start.

At 400 metres standing start, the X3 M40d crosses the line in 13.34 s versus 13.57 s. The 0.23 s gap represents roughly 11 m of track - two to three car lengths.

Past 400 metres, the gap narrows.

At 1,000 metres, the X3 M40d finishes in 24.47 s versus 24.64 s, with just 0.17 s to spare. The X7 xDrive50i fails to fully close the launch gap.

Both rivals share the same electronic speed cap: the X7 xDrive50i and the X3 M40d 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 (5.32 kg/hp vs 5.94 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 8.16 seconds. The 0.34 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.