The press driving presentation of the A 250 e (fuel consumption, combined: 1.5–1.4 l/100 km, power consumption, combined: 15.0–14.7 kWh/100 km, CO2 emissions, combined: 34–32 g/km) and the B 250 e (fuel consumption, combined: 1.6–1.4 l/100 km, power consumption, combined: 15.4–14.7 kWh/100 km, CO2 emissions, combined: 36–32 g/km1) marks the end of a development phase that began for me in 2014, when I helped to define the requirement specifications for the hybrid drivetrain. During this time, we made several difficult decisions, which fortunately proved to be correct.