Hi Mr. Karthik,
This is in regards to your query posted on the website CarDekho.com, we would like to inform you that the mileage does not varies from model to model as the engine displacement is same mileage in Hyundai Santro Xing. It varies from the way you drive and driving conditions. You can check on the given link of Hyundai Santro Xing the mileage mentioned is same for all the variants and is calculated on the basis of approximation by our auto experts.
You can easily book a Hyundai Santro Xing from there by approaching to the authorized Hyundai dealer through phone or email. All you need to do is, talk to the dealer and arrange the booking amount and you can get the delivery of the vehicle upon your arrival in the country. To get details of the authorized Hyundai dealers in India, Kindly visit the below link: -
There might be two problems regarding this issue in Hyundai Santro Xing. Either there are some dirt particles present in the throttle body of the vehicle or there might be some issue with the sensors. Kindly take your vehicle to the authorized Hyundai service center and get it checked there by a professional mechanic.