The exact information regarding the cost of the spare parts of the car can be only availed at the nearest authorized service center. We would suggest you to visit the nearest authorized service center for further assistance.
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Mileage of any vehicle depends on several factors such as timely service management, tire pressure management, driving conditions, etc. Moreover, In order to improve the mileage, we would suggest you to drive slower as driving fast can reduce your fuel efficiency by up to 33%. It is best to change gears appropriately and match the gear and the RPM carefully. You have to be careful when going to the tuner. Make sure the tuning is just to keep your engine running at the proper revs to provide maximum fuel efficiency.