I bought Eon Era+ petrol in March 2013 .
Now I have completed my 1 yr with it.
Mileage is 17.8 km with mix drive highway and city.
Highest mileage I got 23 km / ltr . on highway. speed(60-70)
In city with a/c I used to get 13km/ltr
Over all. for middle class its a good option
Negatives:
Shaky . If u drive above 65km speed. pick up is slow.