Porsche 911 Convertible

"The 911 Cabriolet is now as good as its fixed-roof sibling. With a powerful engine, excellent cabin quality and typically Porsche-brilliant handling, the Cabriolet is a delight to drive, while its folding roof means owners can take advantage of sunnier weather to enjoy one of the best, most rewarding motoring experiences possible."

While a 3.0-litre Porsche is obviously not the cheapest thing in the world to run, its quoted economy and emissions figures are pretty decent for something so fast and powerful. Previous experience of Porsche turbocharged flat-six petrol engines suggests they can return highly commendable figures when cruising gently, so we’ve no reason to believe that the 911 Cabriolet will be any different. Add in the 911’s strong resale values, brought about by its desirability, and it should be relatively inexpensive to run for a high-end sports car like this.