Nice thread rksingh1.
Agree with the calculations, which is what the general public looks at when buying a car, and most make the mistake of buying a Diesel over Petrol even without sufficient running.
But there are exceptions to this rule.
For eg-: Ford Fiesta (Classic), the diesel and petrol prices had a differences of just 50k on-road, when we bought the car in 2008. There is a power difference and the Petrol version is more FTD. But the diesel made more sense here, and specially since, the service costs is also the same.
Fiat Linea MJD Vs T-Jet -: The Petrol is more FTD and at the initial price which FIAT was selling it as, the MJD was more economical. Service costs doesnt seem to vary much (as per owner logs)
If I was in the market today for a car, if the Petrol version is more FTD than the diesel and if the initial cost is much lower than the diesel, then I would buy a Petrol car. But, where are the FTD petrol cars? (Except Skoda Laura/Superb)