It's been almost 4 years, I am driving Eon (petrol version) and drove close 100K KM till date.
Car is perfect for small family and 4 peoples can easily sit, whereas with addition of one will create problem for back sitters.
It's good fun to ride vehicle within city as well as on highway. As far as city traffic concern, one can easily move ahead, even from lesser space in comparison to sedan.
Mileage within city is 15-17 kmpl and on highway 18-20 kmpl (without AC), with AC expect a 1-2 kmpl lower efficiency.
To sum up, perfect Car for small family and handy car with low maintenance cost