Why use CNG on a car that is already meant to be economical on petrol?
Why wait hours in CNG lines,have the risk of exploding cylinders and on the other hand screwing up your engine just because of CNG.I mean 15-16 km in the city is just as good as CNG.We don't actually take into account the actual investment on the cng kit,then the maintenance when the engine needs to be overhauled which in turn means you're actually not saving on anything.
Besides that I personally believe the gas resources need to be provided to the industries rather than private consumers,too many cars out there and it's crazy how people who can afford land cruisers and your corollas are running them on CNG when they've spent millions on them.
And to the OP,it's more spacious than the japanese alto and most of the parts of the local alto 1000cc are compatible with it.Besides that it's got the same engine but it produces more power.