Q. Why it has 3 cylinders ,where as elite i20 ,Honda amaze,baleno in 4 cylinders?is there any reason to make this model in 2018 - Freestyle?

3 cylinder engines are smaller in size but performance wise they are comparative. this depends on engineering every company adapts. VW, ford, tata have 3 cylinder engines and all have performance with good mileage too

That's technical which is too big to explain