BMW 128ti F40 vs Mercedes A 250 W177: which is truly faster?

Off the line, the A 250 hits 100 km/h in 6.26 s versus 6.27 s for the Bmw 128ti. The 0.01 s gap is negligible: both vehicles are neck and neck.

At 200 metres, the Bmw 128ti is doing 132 km/h against 134 km/h for the A 250. The gap is 0.01 s. The gap remains stable from the start.

At 400 metres standing start, the A 250 crosses the line in 14.39 s versus 14.44 s. The 0.05 s gap represents roughly 2 m of track — barely a car length.

Past 400 metres, the A 250 continues to build its lead. At 600 metres, it runs at 188 km/h versus 184 km/h. At 1,000 metres, the A 250 finishes in 25.56 s versus 25.86 s, with a 0.30 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.

On paper, the Bmw 128ti combines 265 hp, 400 Nm and 1,445 kg — a clear theoretical edge over the A 250. Yet the A 250 launches quicker. At standstill, both motors deliver peak torque from 0 rpm: the decisive factor is no longer raw power, but available grip. If the A 250 has a better traction coefficient (tyres, weight distribution, traction control calibration), it puts down more force despite inferior specs — exactly what the simulation reflects, calibrated on manufacturer 0-100 km/h times.

Both rivals share the same electronic speed cap: the Bmw 128ti and the A 250 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 (5.45 kg/hp vs 6.47 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 9.33 seconds. The 0.01 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.