EV Running Cost vs Petrol Running Cost in India: Real Calculation for 2026

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Electric cars are often marketed as dramatically cheaper to run than petrol cars, but how much money do you actually save in India? The answer depends on your electricity tariff, petrol price, charging losses, real-world efficiency and, importantly, how many kilometres you drive. To make the comparison practical rather than theoretical, this article uses the current-generation 2026 Tata Nexon and Nexon.ev as examples, with current India pricing and a Gujarat/Ahmedabad electricity-and-fuel example. Tata currently lists the Nexon from about ₹7.40 lakh ex-showroom, while the Nexon.ev starts at ₹12.49 lakh.

EV vs Petrol: What Are We Actually Comparing?

The simplest calculation is energy cost per kilometre. A petrol car pays for every litre consumed, while an EV pays for every unit of electricity used to recharge its battery.

For the petrol example, the 2026 Tata Nexon 1.2-litre turbo-petrol manual has an ARAI-certified efficiency of 17.44 kmpl. Independent real-world testing puts it closer to 16.03 kmpl. That distinction matters because an EV-versus-petrol calculation based only on laboratory figures can make either car look better than it will in everyday driving.

For the EV, the Nexon.ev 45 uses a 46.08 kWh battery and has a certified range of 489 km. Tata's own reference figures give an estimated real-world range of approximately 350–370 km.

Real Petrol Running Cost: Tata Nexon 2026

For a transparent calculation, let's use Ahmedabad petrol at ₹101.83 per litre, the rate reported for September 2026. Fuel prices vary between cities and can change, so this figure should be treated as a location-specific example rather than a permanent national price.

Using the Nexon's tested 16.03 kmpl figure:

• Petrol required for 100 km = 100 ÷ 16.03 = 6.24 litres
• Cost for 100 km = 6.24 × ₹101.83 = about ₹635
• Cost per km = about ₹6.35
• Cost for 1,000 km = about ₹6,350
• Cost for 15,000 km/year = about ₹95,300

If we instead use the official 17.44 kmpl figure, the theoretical fuel cost falls to roughly ₹584 per 100 km. This is why we prefer showing both claimed and real-world numbers instead of presenting the ARAI figure as the amount every owner will achieve.

Best Nexon petrol variant under ₹10 lakh

The mid-range turbo-petrol manual variants are a sensible value point at around ₹8.2–9.5 lakh ex-showroom. They retain the 1.2-litre turbo-petrol engine while moving above the absolute base trim. Variant pricing can change with Tata's updates and offers, so buyers should verify the final price with Tata Motors before booking.

Real EV Running Cost: Tata Nexon.ev 45

The EV calculation needs one extra step because the energy stored in the battery is not exactly the same amount of electricity drawn from the wall. Charging involves losses. Rather than pretending that every kWh purchased reaches the battery, this calculation uses a 10% charging-loss assumption.

Tata quotes a real-world range reference of 350–370 km for the Nexon.ev 45. Using the midpoint of 360 km:

• Battery capacity = 46.08 kWh
• Reference real-world range = 360 km
• Battery energy required per km = 46.08 ÷ 360 = 0.128 kWh/km
• After allowing 10% charging loss = approximately 0.141 kWh/km from the grid

Gujarat's residential tariff schedule lists energy charges of ₹3.05/unit for the first 50 units, ₹3.50 for the next 50, ₹4.15 for the next 150 and ₹5.20 above 250 units for ordinary urban residential consumers. These are energy charges; electricity duty, fuel-adjustment and other applicable charges can affect the final bill.

To avoid pretending that one household's complete electricity bill is identical to another's, we will use ₹5.20/kWh as the marginal energy-charge example for the calculation:

• EV electricity cost per km ≈ 0.141 × ₹5.20 = ₹0.73/km
• Cost for 100 km = about ₹73
• Cost for 1,000 km = about ₹732
• Cost for 15,000 km/year = about ₹10,980

That is dramatically lower than petrol in this particular tariff-and-fuel-price example. However, public fast charging can cost considerably more than home electricity, so an EV owner who depends heavily on paid public chargers should not use the ₹0.73/km figure as a universal number.

• EV vs Petrol: 1,000 km and 15,000 km Compared

Cost factor	Tata Nexon Petrol	Tata Nexon.ev 45
Energy source	Petrol	Electricity
Efficiency used	16.03 kmpl real-world test	350–370 km real-world; 360 km midpoint
Example energy price	₹101.83/litre	₹5.20/kWh energy charge
Cost per km	₹6.35	₹0.73
Cost per 100 km	₹635	₹73
Cost per 1,000 km	₹6,350	₹732
Cost for 15,000 km/year	₹95,300	₹10,980
Annual energy-cost difference	About ₹84,300 in favour of the EV

Calculation note: The petrol figure uses a real-world tested 16.03 kmpl. The EV figure uses Tata's 350–370 km real-world reference and a 10% charging-loss assumption. The electricity calculation uses Gujarat's ₹5.20/kWh upper residential energy-charge slab and excludes electricity duty, fuel-adjustment charges, fixed charges and public-charging fees. Therefore, the table is a transparent example, not a promise of an identical bill for every owner.

But Is the EV Actually Cheaper to Own?

This is where the calculation becomes more interesting. The EV saves a lot on energy, but its purchase price is higher. The Nexon petrol starts at roughly ₹7.40 lakh ex-showroom, while the Nexon.ev range starts at ₹12.49 lakh.

Using a simplified comparison between the starting prices, the initial difference is roughly ₹5.1 lakh. At an illustrative annual energy saving of around ₹84,000, the arithmetic payback period is approximately six years.

But this is not a six-year guaranteed payback. Insurance, servicing, financing, tyres, resale value, battery warranty, electricity tariffs, petrol prices, charging infrastructure and the exact variants being compared can all change the result. The comparison also isn't between identically equipped variants, so the purchase-price gap should not be treated as a perfect ownership-cost calculation.

The important point: an EV's low running cost is real, but whether it saves you money overall depends heavily on how much you drive and where you charge.

Who Should Buy an EV and Who Should Stay With Petrol?

• Choose an EV if you drive around 1,000–1,500 km or more every month, have convenient home charging and expect to keep the car for several years.
• Choose petrol if your annual mileage is low, you regularly undertake unpredictable long-distance trips and cannot conveniently charge at home.
• Home charging is the key advantage: the economics are strongest when most charging happens at home rather than at expensive DC fast-charging stations.
• Don't compare only ARAI figures: real-world petrol efficiency and actual EV range can be substantially different from laboratory figures.

For city-heavy Indian usage, an EV can therefore be remarkably cheap to run. For occasional users, however, the higher upfront purchase price can take much longer to recover. The right answer is not simply "EV is cheaper"; it is "EV is cheaper to run, and high-mileage owners are more likely to benefit from that difference."

Verdict

On pure energy cost, the EV wins by a huge margin. In our 2026 Gujarat example, the Nexon.ev 45 works out at roughly ₹0.73 per km using Tata's real-world range reference and the selected residential electricity energy charge, compared with about ₹6.35 per km for the petrol Nexon using an independent real-world test figure and Ahmedabad's September 2026 petrol price.

However, the cheapest kilometre does not automatically make the EV the cheapest car to own. The higher purchase price, charging access and driving pattern matter. If you can charge at home and drive a lot, the EV's running-cost advantage becomes much more meaningful. If you drive only a few thousand kilometres a year, petrol may still make more financial sense.