Porsche Cayenne Diesel 958.2 vs BMW X6 xDrive30d F16: which is truly faster?

Off the line, the X6 xDrive30d hits 100 km/h in 6.75 s versus 7.11 s for the Cayenne Diesel. The 0.36 s gap is negligible: both vehicles are neck and neck.

At 200 metres, the X6 xDrive30d is doing 122 km/h against 118 km/h for the Cayenne Diesel. The gap is 0.12 s. The challenger starts to claw back ground.

At 400 metres standing start, the X6 xDrive30d crosses the line in 14.94 s versus 15.22 s. The 0.28 s gap represents roughly 11 m of track - two to three car lengths.

Past 400 metres, the X6 xDrive30d continues to build its lead. At 600 metres, it runs at 168 km/h versus 163 km/h. At 1,000 metres, the X6 xDrive30d finishes in 27.44 s versus 28.17 s, with a 0.73 s lead. Both vehicles have similar top speeds (217 vs 230 km/h), preventing any comeback.

Both rivals are electronically governed, but not at the same level: the Cayenne Diesel is capped at 217 km/h, the X6 xDrive30d at 230 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.

With two combustion powertrains, the difference comes down to power-to-weight ratio (8.05 kg/hp vs 8.00 kg/hp) and transmission (Unknown vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 11.83 seconds. The 0.36 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.