Sports cars aren’t necessarily expensive to run. Opt for a Mazda MX-5 with a 1.5-litre petrol engine and you can expect to see around 45mpg, and you could see a similar return from the Alpine A110. That’s if you’ve got a light right foot. Drive a sports car in the manner they’re intended and you’ll see that fuel economy plummet like a stone. You also need to factor in the cost of insurance, servicing and parts.