Reset your trip A, try driving it for 100 km and then see how much milage uou are getting.
You see when i bought my car, it was giving me 15km on avg (but this is what i beleved was in general) which was not the case. The person before me whom i bought the car from was a hyper miler and would drive the car on very light foot so the car had been showing this avg milege on trip A because i had not reset the Trip A.
And the day i reset my trip A, my milege was drastically decreased. So this is how i got to know that i am not a good driver when it comes to fuel saving