What is it?
This is the cleanest, greenest model in Citroën’s new C4 range: the e-HDi.
The micro-hybrid e-HDi powertrain incorporates a clever stop-start system that’s driven by the alternator. This reduces the need for a beefed-up starter motor so restarts are smoother and quicker.
Throw in all the usual eco-model add-ons, including regenerative braking and low-rolling-resistance tyres, and you have a C4 rated at 67.3mpg combined (15 per cent better than a standard 1.6 HDi) and 109g/km of CO2.
What’s it like?
In practice, the stop-start system is fast and discreet in its operation to the point where, after a while, you don’t even notice it’s there. Even with the usually slow-witted six-speed automated manual ’box, progress off the line is smooth.
The gearbox is a mismatch when it’s paired with the 154bhp 1.6 THP petrol engine, but it is far better suited to the less urgent, steadier character of the 110bhp 1.6 HDi unit. The speed of gearchanges still frustrates, but they are smoother and faster and help put you in the eco-driving mindset.