Those buying a diesel car have a different set of priorities. Factors like ease of driving, refinement and comfort which are of great importance to the petrol car buyer are often inconsequential to hardcore diesel heads. Hence when rating these small diesels, price, fuel efficiency and the cost of ownership get more weightage than other factors. The Uno Diesel, not available in Euro II, has a limited long term scope and the Zen D has never been marketed adequately. In contrast, the Indica V2 Diesel is Tata's mainstay and is the best supported car in this segment. It's also the most improved.