Mercedes-Benz is rolling out its third-generation plug-in hybrid technology to the A and B-Class line-ups as part of its EQ Power range.

The new A 250e plug-in hybrid

Developed as part of plans to extend Mercedes’ plug-in hybrid offering to more than 20 model variants by 2020, the A 250e and B 250e feature a drivetrain teaming up a 75kW motor with a 1.3-litre four-cylinder petrol, giving an output of 218hp and 450Nm.

The A 250e hatch and saloon bring combined CO2 emissions of 33-34g/km along with combined fuel consumption of 188-202mpg with a 0-62mph time of 6.6 seconds and a top speed of 146mph for the saloon.

For the B 250e, the economy figures stand at 32-36g/km and 177-202mpg. Both models offer NEDC-rated electric operating ranges of 43-47 miles.

The 15.6kWh lithium-ion battery, supplied by Daimler subsidiary Deutsche Accumotive, is located under the rear seats, bringing a claimed minimal reduction in boot capacity although figures have not been released, and can be charged using AC and DC chargers direct.

Making a first for a Mercedes-Benz vehicle, the combustion engine is started by the electric motor – the plug-in hybrids do not have a separate 12-volt starter.

Mercedes-Benz has also updated its EQ Power models to offer ‘Electric’ and ‘Battery Level’ drive modes along Comfort, ECO and Sport modes, enabling the driver to prioritise electric driving, driving dynamics in combined drive mode or combustion mode to save electric range.

Other features include pre-entry climate control, which can also be activated via smartphone.

The A 250e pricing for the UK is expected to come in around £35k.