EV vs Petrol: Full Cost Comparison for UK Drivers in 2025

The question of whether an electric car makes financial sense has become more interesting as prices have changed, charging infrastructure has expanded, and the tax treatment of EVs continues to differ significantly from petrol and diesel vehicles. The answer depends on how you use your car, how you charge it, and whether you are comparing a privately owned vehicle or a company car.

This guide looks at the full cost picture for 2025: what EVs cost to buy compared to equivalent petrol cars, what they cost to run and service, how the charging versus fuelling comparison plays out for different driver profiles, and the very significant company car tax advantage that still applies to electric vehicles. Use our EV vs petrol calculator to model the full five-year cost comparison for your situation.

Purchase price: the gap is narrowing but still real

The purchase price premium for EVs has been the main barrier to adoption, and it remains real in 2025. A mass-market electric car like the Volkswagen ID.3 or Nissan Leaf typically costs £5,000 to £10,000 more than a comparable petrol hatchback when comparing list prices. At the entry level, the gap can be smaller; at the premium end, established EV models from BMW, Mercedes, and Tesla carry significant premiums over their petrol equivalents.

Used EV prices have softened considerably since 2022 and 2023, partly because the market was flooded with ex-lease cars as the fleet sector electrified rapidly. A three-year-old, moderate-mileage EV can now be bought at a price that makes the comparison with petrol much more favourable. For private buyers doing the numbers, the used EV market offers a different calculation from new.

Government support for new EV purchases in the UK currently focuses on the plug-in car grant, which in 2025 is restricted to electric vans and electric motorcycles for private buyers. The grant that previously reduced the price of passenger EVs was withdrawn for new cars in 2022. Some local authorities and energy companies offer incentives for home charger installation, but these vary.

Fuel versus charging: the cost per mile comparison

The running cost advantage of an EV over a petrol car depends heavily on how you charge. Home charging using an off-peak electricity tariff, typically available through smart meters and EV-specific tariffs offered by energy providers, gives you the best cost per mile. At roughly 7p to 10p per kWh for off-peak overnight electricity, a 60 kWh battery costs £4.20 to £6.00 to charge from empty, giving a range of around 200 to 250 miles depending on conditions. That works out at roughly 2p to 3p per mile.

A petrol car doing 40 to 45 miles per gallon at current petrol prices of around £1.45 per litre costs roughly 14p to 16p per mile to fuel. The fuel cost difference is therefore substantial if you charge primarily at home. Over 12,000 miles per year, the EV driver spending 2.5p per mile pays around £300, while the petrol driver spending 15p per mile pays around £1,800. That £1,500 annual saving is meaningful and compounds over the ownership period.

The picture changes significantly for drivers who rely on public rapid charging. Rapid chargers typically cost 60p to 80p per kWh in 2025, which at 4 to 5 miles per kWh brings the cost per mile to 12p to 20p. At those rates, the fuel cost advantage essentially disappears or reverses. This is why EV economics depend heavily on having home charging available. Flat dwellers and those without private parking who rely on public charging do not get the same financial benefit.

Servicing and maintenance costs

Electric cars have significantly fewer moving parts than petrol cars. There is no engine oil, no timing belt, no gearbox in the traditional sense, no exhaust system, and no clutch. The components that wear out in petrol cars either do not exist or wear more slowly in EVs. Brake pads, for instance, last considerably longer in EVs because regenerative braking does most of the deceleration work.

The average annual service cost for an EV is typically £150 to £250, covering safety checks, tyre rotation, cabin air filter, and brake inspection. A comparable petrol car typically costs £250 to £450 per year for equivalent servicing, with additional costs for consumables like oil, filters, and spark plugs. Over five years, the service cost saving might be £500 to £1,000, not transformative but a real contribution to the overall cost picture.

Battery replacement is the single biggest maintenance risk for EV ownership and the item that most concerns prospective buyers. Modern EV batteries are warranted for 8 years or 100,000 miles by most manufacturers, and real-world experience suggests they degrade more slowly than early EV batteries. At the end of warranty, a battery replacement can cost £5,000 to £15,000 depending on the vehicle, which is why the residual value of older EVs outside warranty can be uncertain. Checking the battery health of a used EV before buying is sensible.

Company car tax: where EVs have a major advantage

If you use a company car, the Benefit in Kind (BIK) tax treatment of EVs is dramatically more favourable than petrol or diesel vehicles, and this is arguably the strongest financial argument for EV adoption in the UK in 2025.

BIK tax on a company car is calculated as a percentage of the car's list price, determined by its CO2 emissions. For a petrol car emitting 100g/km CO2, the BIK rate is 25%, meaning a £30,000 car generates a £7,500 taxable benefit. A higher rate taxpayer pays 40% of that: £3,000 per year in extra income tax. For a diesel car at similar emissions, add a 4% diesel supplement, so the BIK rate is 29% and the tax bill is £3,480.

For a fully electric car, the BIK rate is 2% in 2025/26. On the same £30,000 list price, the taxable benefit is just £600. A higher rate taxpayer pays £240 per year. The difference in annual tax is £2,760. Over three years, the BIK saving alone is £8,280 for a higher rate taxpayer. The company's Class 1A NI contribution follows the same percentage, so the company also saves on NI when providing an EV rather than a petrol car.

Road tax and clean air zones

EVs were exempt from Vehicle Excise Duty (VED, road tax) until April 2025, when they became subject to the standard annual VED charge for the first time. For 2025/26, a newly registered EV pays the standard rate of £190 per year from its second year onward. This was a change the government signalled well in advance, and it reduces but does not eliminate the annual cost advantage versus petrol cars, many of which pay the same standard rate once they are beyond the first year.

Clean air zones and low emission zones continue to expand across UK cities. EVs are exempt from all current UK clean air zone daily charges, including London's ULEZ and the zones in Birmingham, Bath, Bristol, and other cities. For drivers who regularly travel into urban areas with these charges, the daily saving can be meaningful. London's ULEZ charge for non-compliant vehicles is £12.50 per day.

When does an EV actually make financial sense?

Synthesising all the above, an EV makes the strongest financial case for someone who has home charging available, drives moderate annual mileage (10,000 to 20,000 miles), and either uses it as a company car or buys a used EV where the purchase price premium over petrol is small. In those circumstances, the running cost savings and tax advantages can make EV ownership clearly cheaper over a five-year horizon.

An EV makes a weaker case for someone who relies on public charging, drives very low mileage where fuel savings are small in absolute terms, or is comparing a premium-priced new EV against an equivalently aged petrol car. High-mileage drivers who charge at home get the maximum fuel saving benefit, which can tip the balance strongly in favour of electric even where the purchase price premium is significant.

Use the EV vs petrol calculator to input your own annual mileage, charging situation, purchase prices, and whether this is a private or company vehicle. The five-year total cost comparison gives a more complete picture than looking at any single factor in isolation.