Dear Abhinav ji,
Greetings !!
1. Tata Motors has CNG in 4 cars
a. Tiago
b. Tigor
c. Punch
d. Altroz
No CNG in Nexon as of now.
There are some differentiation offered by Tata Motors in terms of :- Twin Cylinder which enhance boot space, starting car directly in CNG Mode but biggest issue which remains intact is
> performance : which feels lackluster at 60+ Speed. somehow the CNG Kit is tuned for city use but at higher speed - car performance goes for a toss with substantial slow pickup and would be a slight challenge to overtake
> Noise : Engine is Audible, noisier at times
> Long Term reliability is yet to be proven. Still some minor niggles are there which can be observed.
2. Hyundai CNG has a term where CNG Kit is sourced through external vendor and warranty is provided by CNG Kit Manufacturer and not by Hyundai. Attached confirmation
Best Buy: Maruti CNG Kits are proven and offered the best calibration in terms of Performance, Reliability
There S CNG Kits are proven with time and due to bigger 1.5 Litre Engine which is 4 cylinder one
> More smooth pickup
> Engine Noise, Vibration is much more refined
> 1.5 Litre engine has smooth low end - you get better low end pickup and car pickups in much better way as against Tata Cars - no overtaking issue as such till 80 speed
> Easy Ingress, Egress
> Even end mileage to be slight better too
> Maruti ensure complete ownership of CNG Kit Warranty (and not through CNG Vendor)
Overall from Performance, Reliability, Long term peace of mind - Brezza Lxi CNG is excellent pick. Additionally is a 4 star safety rated car too.
What wont like
> You specified budget of 9 Lakh - somehow Brezza Lxi CNG will cost in almost 10.5 Lakh On Road
> As is basic model - lacks some features and you need to spend slight more for
> Waiting Period is relatively higher
Alternatively - if dont wish to exceed budget too much may even check out :-
a. Fronx Sigma CNG
b. Baleno Delta CNG
Both available at around 9.25 to 9.5 on road (depending on city) and excellent buy basis space, features, performance, reliability too
So overall
First recommendation is Brezza Lxi CNG. But if getting higher waiting or finding too pricey - may check second choice as Baleno Delta CNG or Fronx Sigma CNG