Mitsubishi CZ 1.5 Diesel info wanted

[gsr600]

Hi
Who can tell me what the fuel consumption is on 1 of these cars,manual preferably
i have all the info from mitsu brochure -but we all know these are inflated figures. i just want some real world driving statistic,
as diesel is far more expensive to buy in the first place,
i have done some sums on variants regarding costs between petrol & diesel for driving 250 miles a week
50mpg diesel would cost almost the same as a petrol car doing 44mpg
so why does everyone want a diesel in the first place.
i await your replies