Best design so far but...

I did a test drive of the XZ petrol varient. Pros: Very nice look and feel. No matter what, the quality is top notch. Driving experience is very good. 5 star rated Indian car. Cons: Felt that engine could have been smooth. There is bad opinion on after sales from everyone on TATA in market. It has got a 3 cylinder petrol engine. I wonder why? Company engine warranty is 75000 KM or 3 years. More over, I am worried about the mileage of this car.