Factory CNG vs petrol: why a 1,900 km/month break-even rule is not universal
A viral rule saying factory CNG only makes sense above 1,900 km a month is not universal. The break-even point changes with local fuel prices, the exact petrol-versus-CNG purchase gap, real efficiency, annual distance and how long the car will be kept.
November 2026 CNG examples
| Location | CNG price |
|---|---|
| Ahmedabad | ₹98.45/kg |
| Sonipat / Jind | ₹96.50/kg |
| Several UP districts | ₹109.50/kg |
| Nainital / Howrah | ₹103.50/kg |
These HPCL prices are effective 1 November 2026 and show why a single national threshold can mislead. Factory integration and calibration do not alone prove a particular buyer will save money.
Use a transparent calculation
- Petrol cost/km: same-city dated petrol price ÷ labelled petrol efficiency.
- CNG cost/km: local CNG price ÷ labelled CNG efficiency.
- Saving/km: petrol cost/km minus CNG cost/km.
- Break-even distance: exact like-for-like on-road price gap ÷ saving/km.
- Break-even time: break-even distance ÷ expected monthly running.
Use the same city and date for fuel prices, equivalent trims, clearly labelled efficiency and a defined ownership horizon. What are the exact model and variants, city, dated petrol price, on-road gap, efficiency figures and expected kilometres per month?
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