Hi Raj, Thank you for getting in touch with us. Volkswagen POLO does not comes with company fitted CNG Kit. Hence, you need to get it installed from outside.
We always recommend our customer to opt for a company fitted CNG kit because it does not affect the engine. Rest, if you are getting it installed from outside, then please get in touch with the nearest service center once. After the installation, you can expect a mileage of around 25-30 KM/Kg.
Yes you can get it installed. But we won't recommend it . Since, it will void warranty. CNG is best suited alternate fuel option instead of LPG. However, there are no CNG filling stations available in Faizabad UP. The nearest one is in Lucknow.
We would not recommend a CNG kit on Brio for it doesn't have a lot of low end torque in the first place and the kit makes it worse. On CNG, it will require a lot of throttle input to get it going in the first and second gear. Hence, we would not recommend you to get CNG kit fitted..