Very poor mileage.., high service and maintenance cost

I bought Grand i10 Sports Petrol in February 2018. The salesperson told that it gives mileage 18-19 kmpl on road and 16- 17 in city. But it's totally wrong . Car gives the mileage only 12-13 kmpl in city and 15- 16 onroad. It's my strong recommendation please don't buy grand i10 petrol, you will definitely regret. Tata tiago and wagonr are better options. And also the servicing cost and spare parts are very expensive. Don't take it as truth of what salesperson tell you.