CNG vs diesel: cheaper to run, but at what cost?
CNG vs diesel running cost in India: cost per kilometre, yearly fuel spend, break-even distance, and the practical trade-offs for each fuel.
Updated 2026-08-04 · figures computed from the same engine as our fuel cost calculator
CNG costs ₹2 less per kilometre to run than diesel — about ₹21,333 a year at 1,000 km a month. It is also no more expensive to buy, so there is no break-even to wait for.
Diesel
Better mileage and torque, but higher purchase premium, costlier servicing, and a 10-year NGT age cap in Delhi-NCR.
CNG
Cheapest running cost of any ICE option, but boot space is lost to the cylinder, power drops ~10%, and refuelling queues are long outside metros.
Running cost by how much you drive
| Monthly driving | Diesel | CNG | You save |
|---|---|---|---|
| 500 km Light city use |
₹2,472/mo ₹29,667/yr |
₹1,583/mo ₹19,000/yr |
₹10,667/yr |
| 1,000 km Average commute |
₹4,944/mo ₹59,333/yr |
₹3,167/mo ₹38,000/yr |
₹21,333/yr |
| 1,500 km Heavy commute |
₹7,417/mo ₹89,000/yr |
₹4,750/mo ₹57,000/yr |
₹32,000/yr |
| 2,500 km Very high / commercial |
₹12,361/mo ₹1,48,333/yr |
₹7,917/mo ₹95,000/yr |
₹53,333/yr |
Fuel/energy cost only. Servicing, insurance and depreciation differ too — use the true cost of ownership calculator for the full picture.
Common questions
Is CNG cheaper than diesel in India?
CNG is cheaper both to buy and to run in this comparison — at ₹2 less per kilometre, there is no break-even to wait for.
What is the running cost per kilometre of diesel vs cng in India?
At ₹89/L and 18 km/L, diesel costs about ₹5 per km. CNG at ₹76/kg and 24 km/kg costs about ₹3 per km. That is a difference of ₹2 per kilometre, or ₹21,333 a year at 1,000 km a month.
How much can I save a year with cng over diesel?
At 1,000 km a month you save about ₹21,333 a year. At 1,500 km a month it is roughly ₹32,000, and at 2,500 km a month about ₹53,333. These are fuel/energy costs only — servicing and insurance differences are on top.
What are the downsides of cng?
Cheapest running cost of any ICE option, but boot space is lost to the cylinder, power drops ~10%, and refuelling queues are long outside metros.
Other comparisons
Prices are indicative all-India averages and move daily — Delhi, Mumbai and Bengaluru typically differ ₹2–5 per litre from the national average. Mileage figures are realistic city-driving estimates, not ARAI claims.