Diesels are cheaper than petrol...for some of us

Drivers have to do 10,000 miles per year to make buying a second-hand diesel car cheaper than a petrol model, say industry experts.

The disagreement that dogs the motoring industry: diesel or petrol? Yes, the tiff between the two types of motor is still rumbling on. Which is cheaper? Which is greener? Which give a smoother ride? I could go on...