Dont forget the cost of rebuilding a diesel as well. Should something go wrong (it only takes a blown hose) = big $$$$$$ - as a general statement it costs much more than a petrol motor to rebuild. Oil changes (except maybe TD5) are more frequent and generally consume more oil and diesel oil is more expensive than petrol oil etc etc
Also in a whole of life costing should consider km each is capable of doing before a rebuild is necessary, I dont want to start an argument here but IMO V8's generally do more km than Rover diesels. Toyota/Nissan diesels IMHO last longer but you pay more up front compared to the petrol option for the privelege.
