I own a Honda City 4th Generation and have been getting an average fuel efficiency of 16.1 km/l over 85,000 km. Would it be worth installing a CNG kit to improve the mileage further? Please suggest.
With the kind of mileage you are already seeing from your 4th generation Honda City, I would not rush to fit a CNG kit. Around 16 kpl over 85,000 km is actually a healthy real world figure for a petrol sedan, and since the City is known for its smoothness and refinement, adding an aftermarket CNG kit will inevitably change the character of the car. Honda does not offer a factory CNG option for the City, so any retrofit will be third party, which means compromises in boot space, some loss in outright performance and the added variable of installation quality and long term reliability. Honda also recommends using fuel that meets the vehicle specifications, and aftermarket modifications can complicate warranty or support considerations on newer cars.
A CNG conversion only starts making strong financial sense if your running is very high and you plan to keep the car for several more years to recover the kit cost. If your annual usage is moderate, the payback period can be longer than expected. The only real case for going CNG here is if fuel cost reduction is your absolute top priority. Otherwise, given how well your City is already performing, I would leave it as is and enjoy the refinement rather than fixing something that is not really broken.

Honda City
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Thank you so much for your update. Let me keep the car as it is without disturbing the current performance
CNG fitted by honda is 3rd party and if anything goes work or any additional repairs then you have high chances of loosing your warranty. This is very risky .
Also honda has an issue with cng fitting .
I have new honda elevate CVT Should i go for CNG Mileage is low
I own a 2021 4th gen city (petrol) I'm getting around 10-11 in city and 12-13 on highways, especially in hill stations it drops down to less than 9kmpl
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Posted on: 9 May 2026
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