CNG vs Petrol vs EV: The Real Cost Comparison
Which powertrain saves you the most money in India? We ran the numbers on three identical-use cases — a compact hatchback, a family sedan, and an SUV — over 5 years and 75,000 km, factoring in fuel, maintenance, insurance, and resale. The results might surprise you.
How We Calculated
Fuel prices are averaged from June 2026 data: Petrol ₹104/L in Delhi, Diesel ₹92/L, CNG ₹76/kg. Electricity at ₹6/kWh (home charging). Maintenance costs are sourced from manufacturer service schedules. Resale values are from 2026 Orange Book valuations. All figures are before state EV subsidies.
5-Year Cost Comparison (Compact Hatchback)
| Cost Head | Petrol (Swift) | CNG (Swift) | EV (Tiago EV) |
|---|---|---|---|
| Ex-showroom price | ₹7.20 L | ₹8.10 L | ₹8.49 L |
| Fuel cost (75k km) | ₹3.90 L | ₹2.10 L | ₹30,000 |
| Maintenance (5yr) | ₹52,000 | ₹58,000 | ₹22,000 |
| Insurance (5yr) | ₹45,000 | ₹47,000 | ₹55,000 |
| Resale value | -₹3.60 L | -₹3.85 L | -₹3.05 L |
| Total cost | ₹8.47 L | ₹8.40 L | ₹6.51 L |
CNG: The Bridging Fuel
CNG is an excellent option for high-mileage users — over 1,500 km/month, the CNG variant pays back its premium within 18 months. However, CNG loses boot space (the tank takes up 40-60% of the luggage area), and CNG stations are concentrated in Delhi-NCR, Gujarat, and Maharashtra. Only 4,800 CNG stations exist across India vs 80,000+ petrol pumps.
Real Talk: For city driving under 50 km/day, an EV is dramatically cheaper — but only if you have home charging. Without a dedicated charger, charging costs double to ₹12-16/kWh at public DC stations, bringing the per-km cost to ₹1.20.
When Diesel Still Wins
Diesel continues to make sense for heavy SUV buyers doing 2,000+ km/month. The Mahindra Scorpio-N diesel at ₹0.50/km less than petrol saves ₹1.20/km on fuel alone. But with stricter RTO norms (diesel vehicles over 10 years banned in Delhi-NCR), resale risk is growing. Diesel's share of PV sales has fallen from 52% in 2014 to just 14% in 2026.
The Verdict: EV wins on total cost for most urban buyers. CNG is the pragmatic champion for high-mileage highway users. Petrol remains the convenience king but at a premium. Diesel is fading fast.