BMW M8 Competition Convertible F92 vs Audi S6 Sportback e-tron: which is truly faster?

Off the line, the M8 Competition Convertible hits 100 km/h in 3.32 s versus 4.08 s for the S6 Sportback e-tron. Despite lacking instant torque, 625 hp of power compensates. At this point, the M8 Competition Convertible leads by 0.76 s and sits roughly 5 m ahead.

At 200 metres, the M8 Competition Convertible is doing 168 km/h against 146 km/h for the S6 Sportback e-tron. The gap is 0.73 s. The gap remains stable from the start.

At 400 metres standing start, the M8 Competition Convertible crosses the line in 11.14 s versus 12.52 s. The 1.38 s gap represents roughly 65 m of track - a gap visible to the naked eye.

Past 400 metres, the M8 Competition Convertible continues to build its lead. At 600 metres, it runs at 234 km/h versus 191 km/h. At 1,000 metres, the M8 Competition Convertible finishes in 20.23 s versus 23.58 s, with a 3.35 s lead.

Both rivals are electronically governed, but not at the same level: the M8 Competition Convertible is capped at 250 (i.e. 155 mph - industry threshold) km/h, the S6 Sportback e-tron at 240 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 6.31 seconds. The 0.76 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.