It would be unfair to give a verdict here as the Tata Curve is not launched yet. So, we would suggest you to wait for the official launch and stay tuned for future updates.
The Tata Curvv has 1 Diesel Engine and 1 Petrol Engine on offer. The Diesel engine is 1498 cc while the Petrol engine is 1498 cc . It is available with the Manual transmission.