Cars Q&A

I'm currently having Zen Estilo Lxi 2008 model. My daily run is about 60Kms on an average in the Delhi city. I run my car on petrol and due to this my monthly running cost is huge. So to save this, I want to switch to CNG but not in my Zen as the CNG cylinder will occupy all the luggage space. Hence, I want to purchase used car from the following models:- 1) Chevrolet Aveo 1.4 2) Hyundai Accent executive 3) Ford fiesta Please suggest which will suite me well as per my daily run for atleast 3 year down the line considering maintenance and good mileage on CNG. thanks, Ravi Mishra