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What you'll like:
What you won't:
Here's what GTO had to say about the matter:
I will be upfront that I have driven just one car on this list, the Tiago CNG. The other CNG cars I have no first-hand experience with. That being said, Omkar did talk to me about Maruti's CNG implementation and it was just "okay". Am sure Hyundai - being Hyundai - has done a better job with the Grand i10 & Santro CNGs, but again, haven't driven them.
I did love the Tiago CNG's implementation though. This is no CNG kit added as an afterthought. The execution is brilliant. It's very driveable in the city, the car's build is solid, interiors are good and the suspension is sorted.
No hesitation in recommending the Tiago CNG to any economy-oriented person with high running. It's the car that gets my vote.
Here's what Bhpian Sanidhya_mukund had to say about the matter:
Each of them offer something unique. The S-presso is the cheapest, the WagonR and Celerio have relatively better boot space, the Hyundais are feature packed and the Tatas are safe and offer CNG across all variants. This makes the choice very subjective because different factors among these may appeal to different people.
However, when one compares them purely on the basis of CNG implementation, Tata and Maruti rank much higher than the Hyundais in my opinion. While Maruti and Tata use in-house developed kits, Hyundai depends on a company called CEV engineering. The previous Grand i10 and Xcent also had kits from the same company and in those cars, the installation was like a typical aftermarket fitment (filling through the bonnet, no integrated CNG gauge). The newer models may have addressed the issue of the kit looking like an aftermarket fitment, but I haven’t heard good things about it. I asked a couple of cab drivers I know and they told me that CNG related problems are not rectified within the Hyundai dealership, they send you to a different service centre belonging to CEV. I don’t know how far is this true, owners can clarify. A few drivers who drive Xcents also said that “Gaadi bohot jaldi jhatke dene lagti hai”, which I assume, means that it starts misfiring very soon. These made me apprehensive about Hyundai CNG cars. One must also note that both Tata and Maruti cars have a kill switch at the fuel filling nozzle, which prevents the car from starting if the fuel filler cap is left open inadvertently. The Hyundai cars don’t have this. Here in Delhi, all taxis are CNG cars and the general consensus among drivers (at least the ones I have talked to) seems to be that the WagonR and Dzire are more trouble free cars compared to the Hyundai CNG models.
As far as the others are concerned, the S-presso is unsafe and the WagonR is offered in a single bare bones trim level. Even the Celerio comes with doubtable credentials with respect to safety. That only leaves us with the Tiago.
Another thing I noted was that neither Hyundai, nor Maruti offer test drives of the CNG models. Not sure about Tata though.
Here's what BHPian quattroa4 had to say about the matter:
It's better to carry a 10 KG bomb( CNG tank ) in an 4 star GNCAP car rather than in tin boxes of Maruti and Hyundai . Convenience with safety that is in a Tiago .
Check out BHPian comments for more insights and information.