Tata Tiago diesel long term review: After 5,872km and five months

In my last report, I promised that there would be an update as to how the fuel efficiency is affected in the Eco and City modes. In pure Eco mode and by the tankful-to-tankful method, the car gave an efficiency of 17.1kmpl. The car was driven the same way I drive it every day to work and back. No special treatment was given to the accelerator or the gears. Just plain regular driving!
In the next tankful, which was...