Its quite efficient moreover you can get it in go and go+ category. I have seen many captains using city on Careem, they all claim 20+ milage after engine overhaul/replacement etc. but not personally verified or tested.
The car itself is agreat entry level sedan, parts are easily available and abundant, performance is very good, interior space and AC are great. Overall a win win.
You should not expect "perfect condition" car after 11 years. Be realistic in your expectation. You can find a kharki hui idsi in around 7.5 lacs and the 5 star condition for around 12. Rest everything will be in between.