Electric cars cost less to run than petrol or diesel cars, but the savings depend on your electricity rates, how far you drive, and whether you own or rent your home

The real money in electric cars comes from fuel and maintenance, not from the purchase price. Charging an EV costs roughly one-third to one-half what petrol costs per mile, depending on your local electricity rates and the car's efficiency. You also skip oil changes, transmission fluid, spark plugs, timing belts, and most brake wear because regenerative braking does most of the stopping. These two things alone—cheaper fuel and simpler mechanics—add up to thousands of pounds over the car's life.

But "savings" only matter if you can actually use them. If you rent your home, you may not be able to install a home charger, which means you pay more per kilowatt-hour at public networks. If you drive fewer than 10,000 miles a year, the fuel savings stay small. If electricity in your region costs more than average, the advantage shrinks. The benefit is real, but it is not automatic.

Key Takeaways

  • Charging at home costs roughly one-third to one-half the price of petrol per mile, but this varies by region and your electricity tariff.
  • Electric cars need no oil changes, spark plugs, transmission fluid, or timing belts, which cuts maintenance costs by hundreds of pounds per year.
  • Regenerative braking means brake pads last much longer than in petrol cars, sometimes 100,000 miles or more.
  • The upfront cost of an electric car is higher than a comparable petrol car, so you need to keep the car long enough for fuel and maintenance savings to offset that difference.
  • Home charging access, local electricity rates, and your annual mileage all determine whether the savings are substantial or modest.

How much cheaper is charging than petrol

Electricity costs vary by region and by time of day. In the UK, a typical domestic rate is around 24p per kilowatt-hour (though this changes), and a typical EV uses about 0.15 to 0.20 kWh per mile depending on the model and driving conditions. That works out to roughly 3.6p to 4.8p per mile. Petrol at £1.50 per litre in a car that does 40 miles per gallon costs about 18.75p per mile. The EV is cheaper, but the gap narrows if you charge on a peak-rate tariff or use public chargers, which often cost 30p to 50p per kWh.

If you drive 12,000 miles a year—close to the UK average—and charge at home on a standard tariff, you might spend £430 to £580 on electricity. The same distance on petrol would cost roughly £2,250. Over five years, that is a difference of around £8,000 to £9,000 in fuel alone. But if you charge mostly at public networks or on an expensive tariff, the saving drops to £3,000 to £4,000 over the same period.

Maintenance costs are genuinely lower, not just theoretically

An electric car has no oil to change, no spark plugs to replace, no transmission fluid, no timing belt, and no exhaust system. These are not small jobs. An oil change costs £30 to £60 and happens every 10,000 to 15,000 miles. Spark plugs cost £100 to £300 and last 30,000 to 100,000 miles depending on the car. A timing belt replacement can cost £500 to £1,500. Over 100,000 miles, a petrol car typically needs £1,500 to £2,500 in routine maintenance beyond tyres and brakes.

An electric car still needs tyre rotations, brake fluid checks, and cabin air filters, but these are cheaper and less frequent. The brake fluid in an EV lasts longer because the brakes do less work—regenerative braking captures the energy from slowing down and feeds it back to the battery, so the friction brakes barely engage during normal driving. Many EV owners report brake pads lasting 100,000 miles or more, compared to 40,000 to 60,000 miles in a petrol car.

Real-world maintenance costs for an EV typically run £100 to £200 per year. For a petrol car, expect £300 to £500 per year once you account for oil changes, filters, spark plugs, and occasional repairs. Over ten years, that is a difference of £2,000 to £4,000.

The upfront cost gap is real and takes time to close

An electric car costs more to buy than a comparable petrol car. A basic EV might cost £25,000 to £35,000, while a similar-sized petrol car costs £15,000 to £25,000. That is a gap of £10,000 or more. Government grants exist in some regions—the UK currently offers a plug-in car grant for certain models under certain price thresholds—but these do not close the gap entirely.

The fuel and maintenance savings have to make up that difference before you come out ahead. If you save £1,500 per year in fuel and maintenance combined, it takes roughly seven to ten years to recover a £10,000 price premium. If you sell the car before that, you may not recoup the upfront cost difference, though used EV prices have been rising as demand grows. If you keep the car for ten years or longer, the savings become substantial.

Home charging access changes the whole calculation

If you own your home and can install a dedicated charger, you charge at the cheapest rate available to you—usually your domestic tariff, sometimes a special EV tariff that is even cheaper. You charge overnight when you want, and you never pay the premium rates that public chargers charge.

If you rent, you may not be able to install a charger. You then rely on public networks, which charge 30p to 50p per kWh or more, depending on the network and the charger type. This cuts the fuel saving in half or more. Some landlords allow chargers, and some new rental properties come with them, but this is not yet standard. If you are considering an EV and rent your home, check with your landlord first and factor in public charging costs.

Tax and insurance are usually cheaper, but not always dramatically

Electric cars are exempt from vehicle excise duty (road tax) in the UK, which saves you £150 to £190 per year depending on the car's age. Some local councils also offer free or discounted parking for EVs, though this varies by location. These are real savings, but they are smaller than the fuel and maintenance advantage.

Insurance for an EV is often similar to insurance for a comparable petrol car, sometimes slightly higher because repair costs for the battery and electric drivetrain can be expensive if there is damage. Get a quote before you buy—do not assume it will be cheaper just because the car is electric.

Real-world scenarios: when the savings add up and when they do not

Scenario 1: You own your home, drive 12,000 miles a year, and keep the car for eight years. You save roughly £1,500 per year in fuel and maintenance combined. Over eight years, that is £12,000, which more than covers the £10,000 upfront cost premium. You also save £1,200 to £1,500 in road tax. The EV makes financial sense.

Scenario 2: You rent, drive 8,000 miles a year, and plan to sell in four years. You charge at public networks at 40p per kWh, which costs about 6p to 8p per mile—not much cheaper than petrol. Your annual fuel saving is maybe £300 to £400. Maintenance savings are smaller because you drive less. Over four years, you save £1,500 to £2,000 total, nowhere near the £10,000 upfront premium. The EV does not make financial sense for you right now.

Scenario 3: You own your home, drive 20,000 miles a year, and keep the car for ten years. Your annual fuel and maintenance saving is roughly £2,000 to £2,500. Over ten years, that is £20,000 to £25,000, which easily covers the upfront premium and leaves you significantly ahead. The EV is a strong financial choice.

Frequently Asked Questions

Do I have to replace the battery, and how much does it cost?

Most EV batteries last the life of the car—typically 150,000 to 200,000 miles or more. If a battery does fail, replacement costs £5,000 to £15,000 depending on the car, but this is rare within the first ten years. Many manufacturers offer eight to ten year battery warranties. Budget for it as a possibility, but do not expect it to happen.

Is charging slower than filling up with petrol?

Yes. A home charger takes six to twelve hours for a full charge. A fast public charger takes thirty minutes to an hour. A petrol car takes five minutes. If you drive long distances regularly and cannot charge at home, this matters. If you drive locally and charge overnight, it does not.

Will an electric car save me money if I drive very little?

Probably not. If you drive fewer than 5,000 miles a year, your fuel saving is small—maybe £200 to £300 annually. Maintenance savings are also modest. The upfront cost premium takes many years to recover. A petrol car makes more financial sense for very low mileage.

Can I charge an electric car at a standard household socket?

Yes, but it is slow and inefficient. A standard 13-amp socket charges at about 2 to 3 kW, which adds roughly 8 to 10 miles of range per hour. A dedicated home charger (7 kW or 11 kW) adds 20 to 40 miles per hour. If you have access to a dedicated charger, the fuel saving is much better.

What happens to the resale value of an electric car?

Used EV prices have risen as demand grows and battery technology improves. A three to five year old EV typically holds 50 to 70 percent of its original value, which is comparable to or better than many petrol cars. Battery condition affects resale value, so a car with a warranty remaining is worth more. Check the specific model you are considering—resale values vary.