Hi Mr. P K Karmakar,
This is in regards to your query posted on the website CarDekho.com,we would like to inform you that Fiat Grande Punto comes in 3 exciting variants i.e. :-
1) 1.2 litre Petrol engine,
2) 1.3 litre Diesel engine and
3) 1.4 litre Petrol engine.
The Fiat Grande 1.2 litre petrol variant offers mileage of 12.0 km/l in city conditions and 16.2 km/l on highways.
Fiat Grande Punto 1.3 litre diesel offers mileage of 13.7 Km/l in city conditions and 17.8 km/l on highways.
Fiat Grande Punto 1.4 litre petrol offers mileage of 11.2 km/l in city conditions and 15.6 km/l on highways. For Further information you can use the given link
Sir, if all the engineers are saying that there is a problem in Punto than they might be right, then you should test another Punto in same variant for that problem. If you feel the same problem in the other car also than the engineers are right. But if you won't found the sane in test vehicle, then there Might be a problem with your tyre or wheel or it might be a problem in suspension system. If the problem is with tyre, then it is a regular problem. But you are saying that the problem appears when it just jumps over a bump. By this, it is sounding as a problem with suspension system.