Petrol in Chennai costs Rs 107.76 per litre and CNG on the Torrent Gas network costs Rs 97.00 per kg (prices as of August 2026). For a typical hatchback that does 18 km/l on petrol and 28 km/kg on CNG, that works out to Rs 5.99 per km on petrol versus Rs 3.46 per km on CNG — a saving of Rs 2.52 every kilometre.
Here is what that difference adds up to every month in Chennai:
Monthly cost: CNG vs petrol in Chennai
| Monthly driving | Petrol cost | CNG cost | You save |
|---|---|---|---|
| 1,000 km | Rs 5,987 | Rs 3,464 | Rs 2,522 |
| 1,500 km | Rs 8,980 | Rs 5,196 | Rs 3,784 |
| 2,000 km | Rs 11,973 | Rs 6,929 | Rs 5,045 |
CNG kit payback period in Chennai
A sequential CNG kit installed in Chennai typically costs around Rs 65,000. At current Chennai prices a CNG conversion pays for itself in about 17.2 months if you drive around 1,500 km a month — a strong case for switching. After that, the roughly Rs 3,784 you save every month is pure gain.
Check your own numbers
The calculator below is already loaded with today’s Chennai prices. Change the driving distance, mileage or kit cost to match your car and see your own payback period.
Prefilled with current Chennai fuel prices. Adjust any value to match your car.
Frequently Asked Questions
What is the CNG price in Chennai today?
CNG in Chennai costs about Rs 97.00 per kg on the Torrent Gas network (as of August 2026). Petrol is about Rs 107.76 per litre.
How much money does CNG save per month in Chennai?
Driving 1,500 km a month, a CNG hatchback in Chennai costs about Rs 5,196 in fuel versus Rs 8,980 on petrol — a saving of roughly Rs 3,784 every month.
What is the CNG kit payback period in Chennai?
With a Rs 65,000 kit and 1,500 km of monthly driving, the payback period in Chennai is about 17.2 months at current prices.
Is converting to CNG worth it in Chennai?
Yes — at current prices the kit pays back in about 17.2 months at 1,500 km/month, which is quick.
What is the per-km cost of CNG vs petrol in Chennai?
About Rs 3.46 per km on CNG versus Rs 5.99 per km on petrol, assuming 28 km/kg and 18 km/l respectively.