If low running costs are at the top of your agenda when looking to buy the DS 3 Cabrio then diesel is the way to go. The lower-powered 1.6-litre engine offers an official combined fuel economy of 83.1mpg.  If you’re after a little more performance then the higher-powered version of the same 1.6-litre unit offers 20bhp more and an official fuel economy of 78.5mpg.

But if you’re a lower-mileage driver doing shorter journeys then petrol may well prove a better option. The cheapest petrol engine to run is the PureTech 110, which achieved 65.7mpg combined on its official round of testing.

In general, DS 3 Cabrio CO2 emissions are very low, with no engine emitting more than 129g/km. It’s the 1.6-litre lower-powered diesel that is the best of the bunch, though, with a CO2 output of just 87g/km. 

We don’t think there’ll be much to be concerned about when it comes to DS 3 Cabrio reliability. There haven’t been any major recalls for this car for a few years now and this latest model is at the top of its game when it comes to durable materials and overall fit and finish.

Included with every new DS is three years’ roadside assistance which should prove useful if the worst was to happen.