In city it will give 12 to 15 km/l
Out of city it will give 19 to 20.8 km/l if you drive below 80km/hr.
In CNG it will give 20 km/ kg in city and 25 to 28 km/ kg out of city.
And realy comfortable car. Sunroof facility is a very good added feature in sx version of petrol engine. And pick is excellent in both petrol and cng. In addition to this, I would like to tell you as there are 8 injector and tepato of engine is hydrolic base auto set, there will be no longer breakdown of head due to cng so u can go for cng in this version for sure. And your middle class luxury sedan car will run at 2 rs/ km. And in petrol around 7 rs/km.
There are vedios also available on YouTube on new verna cng, pls check and do it.