The price of the Tata Nano Diesel 2012 is yet to be finalised, market experts say it will be 15-20 per cent more than the petrol version. The price for the full option Tata Nano diesel car is about 3.5 lakhs. The cost of the base model of Tata Nano Diesel ex-showroom is expected to be upward of Rs.1.5 lakh Rupees. On road price of Tata Nano Diesel will be around Rs. 1.65 lakhs or more depending on the state you live in.