Citroen will launch its second generation Stop & Start technology in 2010 in order to hit 70mpg across its range of petrol and diesel engines.

The French manufacturer said the new system will retain the combined alternator-starter unit, which provides quiet restarts, but will also improve on fuel consumption and emit 110g/km of CO2 emissions.

The next generation Stop & Start will also recover energy during braking and deceleration to recharge the vehicle’s battery without consuming fuel.