i have a 2006 liana RXi FF CNG
And city Vario 2006 with CNG.
The liana gives 170 km in Rs 300 with 50% AC
City gives 125 km in Rs 250 with 50% AC
The liana gives 200 km in Rs 300 with 50% AC
City gives 140km in Rs 250 with 50% AC
But liana has no issues with CNG setting due to its Lambada KIT.
But with the city, i have to get it adjusted every month,
its a real headache. i would definitly suggest liana FF CNG
over city anytime