E20 vs CNG vs Electric: Running Cost Comparison for 2026 India

E20 has pushed many vehicle owners to consider alternatives. CNG conversions are booming. EV sales are climbing. But which option actually saves you the most money per kilometre in 2026? Here are the real numbers.

The three fuel options in 2026 India

For a passenger vehicle owner in mid-2026, the realistic fuel choices are:

• E20 petrol — the only petrol available at regular pumps
• CNG (Compressed Natural Gas) — available in ~6,000 stations, primarily in northern and western India
• Electric (EV) — charging at home or public stations

Each has a different cost structure: fuel cost per km, upfront conversion/purchase cost, and maintenance profile. Let’s break them down.

Running cost comparison (July 2026)

All figures are for Delhi prices, a mid-size car (equivalent to Maruti Swift or Hyundai i20), and assume 30 km of daily driving.

E20 petrol

• Fuel price: ₹102.12/litre (Delhi)
• Real-world mileage: ~17 km/l (from an ARAI-rated 22–24 km/l car)
• Cost per km: ₹6.01
• Monthly cost (900 km): ₹5,407
• Annual cost (10,950 km): ₹65,810

CNG

• Fuel price: ₹76.61/kg (Delhi, July 2026)
• Real-world mileage: ~24 km/kg (factory-fitted CNG in Swift/i20 class)
• Cost per km: ₹3.19
• Monthly cost (900 km): ₹2,873
• Annual cost (10,950 km): ₹34,930

Electric (home charging)

• Electricity cost: ₹6–8/kWh (domestic tariff, varies by state)
• Energy consumption: ~12 kWh/100 km (Tata Nexon EV class)
• Cost per km: ₹0.84 (at ₹7/kWh)
• Monthly cost (900 km): ₹756
• Annual cost (10,950 km): ₹9,198

Electric (public fast charging)

• Charging cost: ₹18–25/kWh (varies by network)
• Cost per km: ₹2.58 (at ₹21.5/kWh)
• Monthly cost (900 km): ₹2,322
• Annual cost (10,950 km): ₹28,251

Cost per kilometre summary

But running cost isn’t everything

The per-km numbers make EV look like the obvious winner. But the total cost of ownership includes upfront costs, maintenance, and practical limitations.

CNG: upfront cost and trade-offs

• Factory-fitted CNG: Adds ₹90,000–1,20,000 to the on-road price of a new car. Available in Swift, Dzire, WagonR, Baleno, Grand i10 Nios, Aura, Altroz, and a few others.
• Aftermarket CNG kit: ₹45,000–75,000 for a sequential injection kit installed at a certified workshop. Cheaper kits exist but risk voiding warranty and may not be safe.
• Boot space: The CNG cylinder takes up most of the boot. Not ideal for families.
• Power loss: CNG delivers 10–15% less power than petrol. Hill performance and overtaking suffer.
• Station availability: ~6,000 CNG stations in India, heavily concentrated in Gujarat, Maharashtra, Delhi-NCR, UP, and Rajasthan. Much of south and east India has limited or no CNG infrastructure.
• Maintenance: Similar to petrol. CNG-specific parts (pressure reducer, injectors) add some service cost but are infrequent.
• Safety: Factory-fitted CNG is well-tested. Aftermarket kits vary in quality. Only use BIS-certified kits from authorised centres.

EV: upfront cost and trade-offs

• Purchase price: The cheapest usable EVs start at ₹7–8 lakh (Tata Tiago EV). A Nexon EV starts around ₹14.5 lakh. Comparable petrol cars cost ₹5–10 lakh less.
• Home charging: Requires a dedicated 15A socket or a wall box (₹5,000–25,000). Apartment dwellers without dedicated parking face a real barrier.
• Range: 250–400 km per charge for most EVs. Adequate for city use, limiting for highway trips.
• Charging time: 8–10 hours on a home socket, 45–60 minutes on a fast charger (to 80%).
• Battery degradation: Expect 80–90% capacity after 8 years. Battery replacement costs ₹3–6 lakh depending on the vehicle.
• Maintenance: Significantly lower than petrol or CNG. No oil changes, fewer brake pad replacements (regenerative braking), no fuel system to corrode.
• Resale: Still uncertain. The Indian used-EV market is nascent. Battery health anxiety depresses resale values.

Break-even analysis

How long does it take to recover the higher upfront cost through fuel savings?

CNG conversion (aftermarket, existing petrol car)

• Kit cost: ~₹60,000
• Annual fuel saving vs E20: ₹65,810 − ₹34,930 = ₹30,880
• Break-even: ~23 months

For high-mileage users (Ola/Uber drivers doing 150+ km/day), break-even drops to under 6 months.

EV purchase (vs comparable petrol car)

• Price premium: ~₹5,00,000 (Nexon EV vs Nexon petrol)
• Annual fuel saving vs E20 (home charging): ₹65,810 − ₹9,198 = ₹56,612
• Add maintenance savings: ~₹8,000–10,000/year
• Break-even: ~7–8 years (before considering battery replacement)

With state EV subsidies (where available) and lower road tax, the break-even can drop to 5–6 years.

Two-wheelers: the same maths

For two-wheelers, the picture is different:

• CNG: Not available for two-wheelers in India.
• Electric scooters: Ola S1 Pro, Ather 450X, TVS iQube — priced at ₹1–1.5 lakh. Running cost is ₹0.15–0.25/km on home charging. Break-even vs an E20 petrol scooter (Honda Activa at ₹85,000): 2–3 years for high-use commuters.

Which one should you pick?

Choose CNG if:

• You have CNG stations in your area
• You drive 50+ km/day (higher mileage = faster payback)
• You want to keep your current petrol car
• You don’t need full boot space
• You can’t afford the EV price premium

Choose EV if:

• You have home charging access (apartment parking with a socket)
• Your daily commute is under 100 km
• You’re buying a new vehicle anyway
• You want the lowest running cost possible
• You’re in a state with EV subsidies (Gujarat, Maharashtra, Delhi, etc.)

Stick with E20 petrol if:

• You drive very few kilometres (under 15 km/day) — the savings don’t justify conversion/purchase cost
• No CNG stations exist in your area and you can’t charge at home
• You need long highway range without charging stops
• Your vehicle is post-2023 and handles E20 without damage

The bigger picture

The E20 mandate was meant to reduce India’s crude oil imports. Ironically, it may accelerate the shift to CNG and electric — not because consumers chose those fuels on merit, but because E20 made petrol worse. The demand for fuel choice remains: consumers should be able to buy E0 petrol if they want to. But until that option returns, CNG and EV are the two realistic escape routes from E20’s cost and damage penalties.