If usage is very often particularly long drives, then Diesel will be good. But if there is rare usage, then Petrol is thee best. Many think that diesel car is much cheaper to run than a Petrol one. Its true, only when we consider running costs. But a Diesel engine's maintanance will literally eat up the amount which you saved while fueling.
Pros of Diesel:
* Running cost is low.
* Has more FE compared with Petrol.
* More efficient.
Cons:
* Maintanance cost is high.
* Oil needs to be changed frequently else it gives Smoke.
* Noisy.
* Vibrations.
Nowadays engines are coming with improved technology (Petrol & Diesel), so FE wise there is no much difference. Now the cost difference between Petrol and Diesel is 22 Rs per litre. So while filling in bulk, there may be a huge difference. Say for 25 Litres, we pay Rs 550 approximately more for a Petrol car. But mileage doesnt make much difference. But the amount you saved here will be doubled and given, while coming for maintanance for a Diesel one. So i prefer a Ghee (Petrol) drinking machine rather than a Dalda (Diesel) drinking machine.