Hi Deepak,
Most of the petrol cars that are in the market are compatible with CNG kit.
Only thing that you consider is the boot space. Small cars like Spark, Alto, i10, Astar doesn't has much boot space and it will be completely occupied by CNG tank. Absolutely no boot space available.
Wagon R will be good choice.
Or else go for sedan cars like Accent, fiesta, optra.
You can expect average around 20-24 for small cars and 15-20 for sedans.
" Dont ask god to give what you desire but what you deserve, because your desires may few but you deserves a lot "
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