Hi TFIANS, Even after being in the run for so long and with the technical advancements, why are Diesel engines still costing higher than petrol engines? The injection and turbo charging for diesel had started much before petrol. Gone are the days where having a diesel engine was a nightmare. It is as good, if not better than petrol engine. With such a lot of volumes and being readily available, why are they still costly compared to petrol engines?