I used this maruti suzuki ritz car petro fuel type. It has CNG fitted so I was very happy that it would cost me less and as I am a middle class person. But after 7 months it was showing some engine related problems and then I realize it is not compatible with CNG. And also its interior is worst. And also it has a space problem at backside and leg room. I suffered a lot with this car.
Now I suggest you not to buy this. And also petrol mileage is not good. And its maintenance is average I can handle but overall the car has space problem.