Which one is better i20 magna 1.4 or swift vdi or polo comfortline(diesel) or etios liva gd?

All cars mentioned by you will give more or less similar mileage if driven in the same manner under same traffic conditions. As your next parameter is great performance, please go ahead and buy the i20 Mangna. It's engine is most powerful among all the cars listed by you. However, the i20 is not much fun to drive. The best compromise between mileage, power and fun to drive ratio remains the Swift.

Dude, there is no diesel hatch that can beat Swift at the present time. If you are patient to wait for 6-8 months go for Swift VDi. Hyundai interiors are very good among the three brands and if you are looking for interiors and it gives neat mileage too.

Etios Liva is a good deal diesel hatch for city driving with a great turning radius and amazing bumper to bumper performance. But for sheer love of power packed driving it has to be Swift.