Hi Buch, Tata Nano is equipped with 624 cc engine, that is a very low capacity engine. Fitting of an LPG kit is not possible and not feasible as the power delivered is already quite low and any alternate fuel consumes a lot of power. Thus, it is not possible to fit an external LPG kit in Nano as well, as the engine capacity would not satisfy the minimum requirements for an Alternative fuel. Thanks,
New Tata Nano with EasyShift is available at Rs. 2 lac (Ex-showroom, Delhi), and the final cost depends on the valuation of your car. So, first get the valuation of your car from authorized Tata dealer, so he can give you a final quote for the new car.