If you have been eyeing an electric car but keep circling back to one question, you are not alone. Everyone wants to know the same thing: will switching from petrol actually save money, or is it just a good story that falls apart once real bills arrive? The honest answer depends on how and where you charge, what you currently drive, and how many miles you cover each year.
This guide breaks down every real cost- fuel, electricity, road tax, insurance, servicing, and depreciation-, using current UK figures, so you can work out your own number instead of trusting a headline.
Petrol Prices in 2026: The Starting Point for Comparison
As of September 2026, UK unleaded petrol is averaging around 160p to 165p per litre, with diesel sitting higher at roughly 182p to 191p per litre. Prices have crept up this year partly because of tension in the Middle East affecting global oil supply, and partly because government fuel duty support is due to be scaled back from January 2027.
Around half of what you pay at the pump is tax, so even when wholesale oil prices ease, the retail price rarely drops as much as drivers expect. For a petrol car doing around 40 miles per gallon, that works out to roughly 17p to 19p per mile. A driver covering 10,000 miles a year would spend somewhere between £1,700 and £1,900 purely on fuel, before servicing, insurance or tax are added. If you want the full breakdown of how pump prices are calculated and where that duty actually goes, our guide on petrol price per litre in the UK covers it in more depth.
Why Petrol Costs Are Unpredictable
Petrol pricing is tied to the US dollar, crude oil markets and geopolitical events that most drivers have zero control over. That unpredictability is actually one of the strongest arguments in favour of electric cars: your household electricity tariff, especially an overnight EV tariff, tends to move far more slowly and predictably than forecourt prices.
Electric Car Charging Costs: Home vs Public
This is where the real answer to “is an EV cheaper” hides, because charging cost varies more than most new EV owners expect.
Home Charging on a Standard Tariff
Under the Ofgem price cap for the July to September 2026 period, the standard domestic electricity rate is about 26.11p per kWh, plus a daily standing charge. An efficient EV typically manages 3.5 to 4 miles per kWh, which puts home charging at roughly 7p to 8p per mile. For a driver covering 10,000 miles a year, that is around £700 to £800 annually, less than half of what the same distance costs in petrol.
Home Charging on an Overnight EV Tariff
If you switch to a dedicated EV tariff such as Octopus Intelligent Go or a similar overnight plan, rates can fall to around 7p to 10p per kWh. That brings cost per mile down to roughly 2p to 3p, turning a 10,000-mile year into a charging bill of around £200 to £300. This is the scenario EV adverts love to quote, and for anyone who can charge at home overnight, it is genuinely achievable, not marketing spin.
Public and Rapid Charging
Here is the catch nobody puts on the billboard. Public charging is far more expensive than home charging because operators pay commercial electricity rates and 20% VAT, compared with 5% VAT on domestic electricity.
As of mid-2026, standard public chargers (up to 49kW) average around 51p to 54p per kWh, working out to roughly 16p per mile.
Rapid and ultra-rapid chargers (50kW and above) average 65p to 80p per kWh, which is close to 23p to 24p per mile, almost identical to running a petrol car. So the real story is this: an EV charged mostly at home is dramatically cheaper to run than petrol. An EV that depends heavily on public rapid charging, because you live in a flat with no driveway, for example, may barely save you anything at all, and can occasionally cost more per mile than an efficient petrol car.
Real-Time Example
Take a 60kWh family EV doing an average charge from 10% to 80% (42kWh added).
- On the Ofgem standard rate (26.11p/kWh): around £10.97 per charge, covering roughly 150 miles.
- On an overnight EV tariff (8p/kWh): around £3.36 for the same 150 miles.
- On a public rapid charger (75p/kWh): around £31.50 for the same 150 miles, almost identical to a full tank of petrol in a small hatchback. This single example explains why two EV owners can have completely different opinions on running costs depending purely on their charging habits.
Petrol vs Electric: Cost Per Mile Table
| Cost Type | Petrol Car (40mpg) | EV (Home, Standard Tariff) | EV (Home, Overnight Tariff) | EV (Public Rapid Charging) |
|---|---|---|---|---|
| Cost per mile | 17p to 19p | 7p to 8p | 2p to 3p | 23p to 24p |
| Cost per 10,000 miles | £1,700 to £1,900 | £700 to £800 | £200 to £300 | £2,300 to £2,400 |
| Price volatility | High, tied to oil markets | Low to moderate | Low, fixed overnight rate | Moderate, network dependent |
Road Tax: The Rule That Surprises New EV Owners
For years, “electric cars pay no road tax” was simply true, and plenty of people still believe it. That changed on 1 April 2025. Since then, new electric cars pay a nominal £10 in their first year, then the standard rate of £200 a year from year two onwards, the same rate petrol and diesel cars pay.
Electric cars registered between 2017 and 2025 also moved onto the £200 standard rate. Older EVs, registered before April 2017, pay a reduced £20 a year. There is also an “expensive car supplement” to be aware of. Any car with a list price over £40,000 pays an extra £425 to £440 a year for five years.
For electric cars specifically, the threshold was raised to £50,000 from the November 2025 Budget, which means a mid-range EV is less likely to get caught by the supplement than a similarly priced petrol car. For the full breakdown of bands and how the list price is calculated, see our guide on car road tax in the UK.
Insurance: Does an EV Cost More to Insure?
Electric cars have historically carried higher insurance premiums than equivalent petrol models, mainly because replacement batteries are expensive and there are fewer specialist repair centres. That gap has been narrowing through 2026 as more garages train up on EV repair and battery replacement costs come down.
Even so, it is worth shopping around properly rather than assuming your current insurer offers a competitive EV quote. Our roundup of the cheapest cars to insure in the UK right now is a useful starting point if premiums are a deciding factor for you, and our detailed look at average car insurance costs in the UK breaks down what actually drives your quote up or down.
If you are a newer or younger driver, the insurance gap between petrol and electric can matter more than the fuel savings in year one.
Our guide to the cheapest car insurance options for young drivers walks through practical ways to bring that quote down.
Servicing and Maintenance
This is one area where EVs consistently win. Electric motors have far fewer moving parts than a petrol engine: no oil changes, no exhaust system, no clutch, no spark plugs. Brake pads also tend to last longer because regenerative braking does a lot of the slowing down for you. Most EV owners report servicing costs 20 to 40% lower than a comparable petrol car over several years of ownership, though tyre wear can be slightly higher because EVs are heavier due to the battery pack.
Depreciation: The Cost Most Buyers Forget
Fuel and tax get all the attention, but depreciation is usually the single biggest cost of owning any car, petrol or electric. Electric cars have depreciated faster than average in the past few years as battery technology improved quickly and government incentives shifted, making older EVs look outdated sooner. That trend has been stabilising through 2026 as the used EV market matures and buyers gain more confidence in battery longevity.
If you are buying new, it is worth checking realistic resale value forecasts rather than assuming an EV will hold its value the same way a well-known petrol model does. Our guide on how to decide what used car to buy covers how depreciation should factor into your decision, whichever fuel type you choose.
So, Is an EV Actually Cheaper? A Practical Breakdown
Rather than a flat yes or no, here is how the answer usually plays out.
- Driveway or home charger, 8,000 to 15,000 miles a year: an EV will almost certainly save money, often £600 to £1,200 a year on fuel alone.
- Mostly public or workplace charging: savings shrink significantly, and a fuel-efficient petrol or hybrid may work out cheaper overall.
- Under 5,000 miles a year: fuel savings may not offset a higher upfront EV price, so a used petrol car could be more sensible short-term.
- 20,000-plus miles a year, mostly motorway: home-charged EVs still win comfortably, since the petrol bill compounds fast at that distance. It also helps to think beyond running costs alone. If you are weighing up new versus used, or trying to avoid overpaying at the dealership regardless of fuel type, our guides on buying a new car, used car buying tips and negotiating a lower car price are worth reading before you commit to either fuel type.
Other Running Cost Factors to Consider
A few smaller costs often get left out of EV versus petrol comparisons, but they add up over a year of ownership.
- Charger installation: a home wallbox typically costs £800 to £1,200 fitted, with partial grants sometimes available.
- Congestion and clean air zones: many UK cities currently exempt EVs from these charges, a real saving for regular city driving.
- Company car tax: EVs sit at just 4% Benefit-in-Kind for 2026/27, against 25 to 37% for petrol, worth thousands a year to company car drivers.
- Battery degradation: most manufacturers now guarantee 70% or higher capacity after eight years, so long-term battery health is less of a worry than it used to be.
Conclusion
An electric car is genuinely cheaper to run than a petrol car for most UK drivers, but only if you can charge at home, ideally on an overnight tariff. The savings on fuel, servicing and company car tax are real and well documented, though road tax changes since April 2025 have closed part of the old cost gap. If your daily reality involves mostly public rapid charging, run the numbers carefully before assuming an EV will automatically save you money, because in that specific scenario it might not. The best approach is to work out your own realistic annual mileage and charging setup, then compare that against your current petrol spend, rather than trusting a generic average.
Frequently Asked Questions
Is it cheaper to charge an electric car than to fill up with petrol?
Yes, if you charge at home, especially overnight. Public rapid charging can cost close to the same as petrol per mile.
How much does it cost to fully charge an electric car in the UK?
A typical 60kWh EV costs around £11 to £16 on a standard home tariff, or as little as £4 to £5 on an overnight EV tariff.
Do electric cars pay road tax in the UK in 2026?
Yes. Since April 2025, EVs pay the standard £200 a year VED rate from their second year, ending the previous tax-free exemption.
Are electric cars cheaper to insure than petrol cars?
Not always, but the gap is narrowing in 2026 as more garages offer EV repairs and battery costs fall.
Do electric cars need less servicing than petrol cars?
Yes, EVs typically cost 20 to 40% less to service due to fewer moving parts and reduced brake wear from regenerative braking.
