Honda WRV best for mileage, ground clearance but worst Digipad

I have purchased my Honda WRV car in 2018 diesel version high end. And starting I was getting a mileage of 21 to 22 km/h, after travelling 50 thousand KMs, I have changed the tyres little big more size and the mileage dropped to 18 to 19 km/h. The digi pad of my car got small bubbles and it's working but asked in the Honda showroom Guntur , they said the digi pad will be checked at Vijayawada, till now asked more then 3 times for the address but they are saying, we let you know but still I did not get the address and performance of the car is good and other problem is the pick up is less compare to other cars in the same range. Overall performance is better for having more ground clearance with more mileage compare to other same range cars.