It all depends on your annual mileage and how new a car you are looking to buy (I haven't a clue about Qashqai prices). Having run diesels for the past 18 years I am very much in favour of the fuel consumption and low-rev torque. Furthermore, since I do about 16,000 miles a year of which about 10,000 are abroad (where diesel is much cheaper) I reckon I save about half my fuel costs by using diesel, which equates to around £1000 a year. Having said that, I would be loath to buy a very new diesel because of the uncertainty of its future.