The latest so-called 997 generation 911 holds its value better than most performance cars. The Cabriolet doesn’t retain its value quite as well as the Coupe as it carries a price premium that levels out over time, but it’s still pretty good. Servicing is expensive, but intervals have increased from 12,000 to 20,000 miles over the last generation model.

By family car standards the 911 Cabriolet performs poorly on the environmental front with average emissions of 305g/km of CO2. However the company has worked to reduce this and facelifted Carrera and Carrera S models from 2008 have lower average emissions of 242g/km of CO2 . Considering the performance on offer fuel economy is more than acceptable – the 3.6-litre Carrera returns 29mpg.

Not bad for a car with 345bhp. 911 is a polluting model. With an average of 279 g/km CO2 across the line-up, its emissions are high for a sports cabriolet. It’s worth noting that the line-up does not feature any diesel models, which typically produce less carbon dioxide than petrol engines with similar power outputs. The range is disappointingly thirsty, averaging 24 mpg.

One of the biggest factors that keeps owners coming back to Porsche is the largely hand-built construction process for the 911 which creates a product that is exceptionally well engineered and reliable.