The ARAI claimed mileage of CRDi 1.4 E is 24.0 kmpl. However, the actual mileage totally depends on several factors like driving conditions, road conditions, tyre pressure, etc. In order to improve the mileage, we would suggest you drive slower. Driving fast can reduce your fuel efficiency by up to 33% if you are traveling above 60 mph. It is best to change gears appropriately and match the gear and the RPM carefully.
For CSD availability we would suggest you to exchange your words with the CSD staff as they will be the better person to assist you with the tie-up dealerships. Moreover, you can click on the link to check the nearest dealership - Dealership.
For the availability of spare parts, we would suggest you walk into the nearest service centres. You can click on the following link to see the details of the nearest service centres and selecting your city accordingly - Service centre. Moreover, for an idea of the prices of the spare parts, you may follow the below link - Spare Parts.