EVChargeLab Blog

EV vs Petrol: Which Is Cheaper to Drive in 2026?

Is an EV really cheaper to drive than a petrol car in 2026? Compare electricity, fuel prices, vehicle efficiency and charging costs to see where the savings actually come from.

EV vs Petrol: What Is the Fairest Comparison?

If you are comparing an EV with a petrol car, it is tempting to look at the price of a full battery charge and compare it with the cost of filling a fuel tank. That sounds simple, but it is not really a fair comparison.

A petrol car and an EV use very different amounts of energy to travel the same distance. The better question is much simpler: how much does each vehicle cost to travel 100 km?

Once you put both vehicles on the same distance basis, the difference becomes much easier to understand. Electricity price, petrol price, vehicle efficiency and where you charge the EV can all change the result.

How to Compare EV and Petrol Costs Per 100 km

For an EV, start with its electricity consumption, usually shown in kWh per 100 km. Then account for charging losses if you want to estimate what you actually buy from the electricity grid.

For a petrol car, use its fuel consumption in litres per 100 km and multiply that by the current petrol price per litre.

The basic comparison is:

EV cost per 100 km = electricity used from the grid × electricity price

Petrol cost per 100 km = litres used × petrol price

This gives you a much more useful comparison than looking at the size of the battery or fuel tank.

Example: How Much Does an EV Cost to Drive 100 km?

Let's use a simple example.

Imagine an EV that consumes 17 kWh per 100 km. If we allow for approximately 10% charging losses, the vehicle would need around 18.7 kWh from the grid to put that usable energy into the battery.

At an electricity price of

18.7 ×

Now change the electricity price to

18.7 ×

Nothing about the EV changed. The charging location and electricity tariff changed the result.

That is an important point when someone asks whether an EV is "cheap to run." The answer depends partly on where and when you charge it.

Example: How Much Does a Petrol Car Cost to Drive 100 km?

Now consider a petrol car that uses 7.5 litres per 100 km.

If petrol costs .70 per litre, the calculation is:

7.5 × .70 = .75 per 100 km

Under those example prices, the EV costs considerably less to travel the same distance.

But there is an important catch: these are examples, not universal prices. Electricity and petrol prices vary between countries, cities, charging networks and even different times of day.

Why Home Charging Can Make a Big Difference

For drivers who have access to a home charger, charging an EV can be considerably cheaper than relying entirely on public charging.

The International Energy Agency's Global EV Outlook 2026 says home charging is generally the preferred option for drivers who have access to it because of its affordability and convenience.

The IEA also found that public charging can carry a significant price premium. In its 2026 analysis, public slow charging was reported to cost up to 150% more than residential electricity in some markets, while public fast charging could be up to 240% higher.

That does not mean public charging automatically makes an EV more expensive than a petrol car. It means you should use your actual charging mix when doing the calculation.

If you regularly charge at home and only use a fast charger on road trips, your average charging cost can be very different from someone who has no home charging and depends almost entirely on public chargers.

Our guide Home vs Public EV Charging: Which Is Actually Cheaper? goes into that comparison in more detail.

What If You Mostly Use Public Fast Charging?

This is where the simple "EVs are cheaper than petrol" argument needs some qualification.

Public DC fast charging is designed around convenience and speed. You are paying for access to high-powered equipment, a convenient location and the ability to add a meaningful amount of range relatively quickly.

If most of your charging happens at expensive public fast chargers, your cost per kilometre can move much closer to the cost of running a petrol vehicle. In some situations, it can even exceed it.

That is why EV running costs should always be calculated using the charging prices you actually expect to pay rather than a generic electricity rate.

Electricity Price Can Change the Answer

There is no single electricity price that applies to every EV driver.

Some households have relatively inexpensive electricity. Others have time-of-use tariffs where overnight charging is cheaper. Some drivers may also have workplace charging, solar generation or other charging arrangements that change the effective cost of their energy.

This is one reason two people driving the same EV can report very different charging costs.

If your electricity costs

Petrol Prices Matter Just as Much

The same principle applies to petrol.

A car that consumes 7 litres per 100 km might be relatively inexpensive to fuel when petrol prices are low. The same car becomes much more expensive to run when fuel prices rise.

This is why it is better to compare the two vehicles using your local prices rather than relying on an online example from another country.

For a driver who travels 20,000 km per year, even a small difference in cost per 100 km can become significant over the course of a year.

What Does the 2026 Data Say?

The latest IEA Global EV Outlook 2026 provides a useful real-world picture.

The IEA reports that battery electric vehicles generally have lower running costs than internal-combustion vehicles because they are substantially more energy efficient. It also found that home charging has consistently provided running-cost savings compared with conventional vehicles in major EV markets.

However, the size of those savings varies considerably between markets because electricity prices, petrol prices, vehicle efficiency and annual mileage are all different.

So the more accurate statement is not "every EV is cheaper than every petrol car." It is that EVs often have an energy-cost advantage, particularly when they can be charged at home at a reasonable electricity rate.

EV Efficiency Is Part of the Equation

Two EVs can have very different running costs even if they are charged at exactly the same electricity price.

For example, an efficient compact EV might use around 14–16 kWh per 100 km in favorable conditions, while a large electric SUV can require considerably more energy.

The same thing happens with petrol vehicles. A small efficient hatchback and a large SUV will not use the same amount of fuel to travel the same distance.

That is why energy efficiency matters just as much as the price of energy.

Driving Conditions Also Matter

Real-world efficiency is not fixed. Highway speeds, cold weather, heating, air conditioning, hills, traffic and aggressive acceleration can all affect how much energy a vehicle uses.

The U.S. Department of Energy's Alternative Fuels Data Center explains that EV range and efficiency vary with driving conditions, including temperature, speed, acceleration, hills and payload.

So don't be surprised if your EV's real-world consumption is different from the number shown on a specification sheet.

Don't Forget Maintenance Costs

Fuel or electricity is only one part of the cost of driving a vehicle.

EVs can also have an advantage in routine maintenance because they do not have an internal-combustion engine that needs engine oil changes, spark plugs and many of the other services associated with conventional powertrains.

The U.S. Department of Energy notes that all-electric vehicles typically require less maintenance because their battery, motor and electronics require little regular maintenance, while regenerative braking can also reduce brake wear.

You can read more about this in the Department of Energy's EV maintenance and safety guide.

That does not mean an EV has no maintenance costs. Tyres, brakes, suspension, cabin filters, insurance and other vehicle-related expenses still matter.

What About the Purchase Price?

This article is mainly about running cost, not the complete cost of owning a vehicle.

An EV can have lower energy and maintenance costs but still cost more to buy than a comparable petrol vehicle. On the other hand, incentives, used-EV prices, financing costs and local taxes can change the overall calculation.

If you want to know whether buying an EV actually saves you money over several years, you need a broader total-cost-of-ownership calculation that includes depreciation, insurance, maintenance, financing and purchase price.

How Much Could You Save Per Year?

Let's say your EV costs .50 per 100 km to charge while your petrol car costs .75 per 100 km to fuel.

At 20,000 km per year:

EV energy cost: about 0 per year

Petrol energy cost: about ,550 per year

Difference: about ,650 per year

But remember that these numbers are based on the example prices and efficiency figures above. Your result could be dramatically different.

That is why using your own electricity tariff, fuel price, annual mileage and vehicle efficiency is much more useful than copying someone else's calculation.

Calculate Your Own EV vs Petrol Cost

If you want a number that actually applies to your situation, start with your vehicle and your local electricity price.

The EV Charging Cost Calculator can help you estimate what it costs to charge an EV based on your vehicle, battery and electricity price.

You can then compare that result with what you currently spend on petrol to get a much more realistic picture of your potential fuel savings.

If you're starting with the basic question of how much electricity an EV actually needs, our guide How Much Does It Cost to Charge an Electric Car? explains the calculation step by step.

Is an EV Always Cheaper Than Petrol?

No. And that is actually the most useful answer.

An EV is often cheaper to run on an energy-cost basis, especially for drivers who can charge at home. But an EV that is inefficient and charged mostly at expensive public fast chargers may not have the same advantage.

Likewise, a very efficient petrol car combined with unusually cheap fuel can narrow the gap.

The real answer comes down to four numbers:

• Your EV's electricity consumption
• Your electricity price
• Your petrol car's fuel consumption
• Your local petrol price

Once you have those numbers, the comparison becomes surprisingly simple.

The 2026 Takeaway

For many drivers, an EV can be cheaper to drive than a petrol car because electricity is often used much more efficiently than petrol is converted into motion. The IEA's 2026 analysis supports that broader trend, while also showing why charging location matters so much.

Home charging is usually where the economics look strongest. Public fast charging can reduce or even eliminate the energy-cost advantage when prices are high.

So instead of asking, "Are EVs cheaper than petrol cars?" ask a more useful question:

"What will it cost me to drive my particular EV the distance I normally drive, using the electricity prices I actually pay?"

That number is far more meaningful than a generic headline about EV savings.

Final Takeaway

EVs can offer substantial running-cost savings, but there is no universal answer that applies to every driver.

Your vehicle's efficiency, local electricity price, petrol price, annual mileage and charging location all matter. Home charging can make a particularly big difference, while frequent use of expensive public fast chargers can change the calculation.

If you're considering an EV, run the numbers using your own situation rather than relying on a generic average. Start with the EVChargeLab EV Charging Cost Calculator, then compare your estimated charging cost with what you currently spend on petrol.

That is the simplest way to find out whether an EV is actually cheaper for you.