Need of diesel amt version

I have already using Tata Nano xta auto manual transmission I have done Tiago amt a short test Overall pickup of this car is very good Nano amt Is comfortable at highway and city But when I drive in hills I feel little lack of power But when I test drive tiago amt is didn't feel the lack of power. But only need is Tata company has told they will launch amt version in both petrol and diesel But upto date there is no amt in diesel engine.