Diesel was always traditionally a cheaper fuel compared to petrol to produce then the common rail diesel engine arrived which is much more efficient and giving fantastic fuel mpg returns. Suddenly diesel is more expensive to refine the oil companies say so the price sky rockets and overtakes petrol in price at the pump’s, really, just another example of shafting the public. Diesel cars are unbelievable value and anything above a 2 litre will run literally forever if serviced regularly, yes parts wear and a CPU fault is a rare expensive item which has to be weighed up carefully on the cars age but diesel’s in general are very good value despite the rip off prices at the pumps.