For a used Porsche 911 Turbo Cabriolet model, the car loses about £158 per month in value.

Higher mileage increases depreciation, so keeping the Porsche within the average range helps control this. Regular upkeep is vital, a well-maintained 911 Turbo Cabriolet with a service history will depreciate slower than a neglected one.

With an average, estimated monthly depreciation of £158, the annual total is around £1893.