I think you need to make a video on "How to calculate fuel average of your Alto" as many are using different methods and calculating different averages, best method is to top up your tank, use it more than 3/4 and then again top up & calculate the average. In this way you will be getting accurate average.
Is your car under 4 year extended warranty ?
There are 2 options, either its the time or its the mileage (Whichever comes first), Don't worry if your mileage is low, you can still get it inspected from your dealer as time has passed.