@rehan bhatti what else you expect from 1000cc epsilon engine??
13km/L is more than enough.
btw santro is the machine which has immense difrence at petrol and cng drive,when driver shifts to petrol,due to better throttle response,he likes to floor it,this is the reason why we get less average,13km/L is ample.
@rizkhan,simply get it tuned,change airflter,and remember ''keep the foot light'''at the speed of 40km/h shift 4th.yes yes 4th,then see the magic:D