To purchase a Diesel car for a start is a good motoring investment regards the re-sale & of course how you look after it, service, book stamped etc, the average motorist does around 12000 per year, as said, the derv price is far greater than petrol but at the end of the day it all depends on your right foot regards fuel consumption, the big gain, no damp starting the derv cars are now quieter, if you do intend to bye & are not Mechanically minded take someone with you that's knows about derv's as the spares can work out expensive.