Taking into account initial buying cost, HUGE depreciation, modifications, servicing and maintenance, insurance, road tax and other sundries, fuel is a small part of the cost.
People who sell it based on fuel economy generally do not think of this - they are glad to take a hit of £8000 depreciation when they sell to save a couple of hundred worth of fuel each year - often a no brainer.
Yes, there are cheaper cars to own and run, but if fuel economy is SO important, then they should have bought a diesel Mundano in the first place.
RANT OVER
Brian.