Electric Car vs Petrol Running Costs 2026: The Full Breakdown

The Problem With Most EV Cost Comparisons

Most EV cost articles compare electricity with petrol and stop there. That is like comparing two houses by looking only at the gas bill and ignoring the mortgage, insurance, and council tax.

That is why so many readers stop trusting them. The fuel line matters, but it is not the whole picture. Insurance can take a chunk out of the saving. Tyres can erase more of it. And depreciation is usually the biggest number on the page, whether you buy electric or petrol.

So this article uses six categories: energy, insurance, road tax, servicing, tyres, and depreciation. The result is less tidy than the usual EV headline, but it is much closer to the decision you actually have to make.

Cost 1: Fuel vs Electricity

We need one benchmark before we start. For petrol, this article uses the RAC's average unleaded price of 152.83p per litre on 31 March 2026 and a 40 mpg petrol car. That works out at 17.4p per mile.

For EVs, the working is simply pence per kWh divided by miles per kWh. Using a reasonable 3.5 miles per kWh efficiency figure gives the comparison below.

The best case: cheap overnight charging

This is the scenario EV ads love. Octopus Intelligent Go is currently advertising 7p/kWh, while E.ON Next Drive Smart is advertising 8.5p/kWh. At 7p/kWh, a 3.5 mi/kWh EV costs about 2.0p per mile. Against petrol at 17.4p, that is a saving of roughly £1,537 a year over 10,000 miles.

The realistic middle: standard-rate home charging

This is the number more private buyers should start with. The Ofgem electricity cap for 1 April to 30 June 2026 is 24.67p/kWh. That gives an EV running cost of 7.0p per mile, still about £1,032 a year cheaper than our petrol benchmark over 10,000 miles.

The bad case: public rapid charging only

This is the part weak comparisons hide. Using Zapmap's long-running rapid PAYG benchmark of 76p/kWh, the EV lands at about 21.7p per mile. That is more expensive than petrol on a pure energy basis.

The useful in-between: public slow plus some rapid

A lot of no-driveway drivers live here. If most charging happens at around 54p/kWh on slower public chargers and only some happens at 76p rapid rates, you can end up close to petrol rather than massively below it. That is why our no-driveway guide exists as a separate article.

The free option: workplace charging

If your employer offers free or subsidised charging, ask about it before doing anything else. It changes the whole ownership equation and often does more for the maths than chasing the very cheapest overnight home tariff.

Cost 2: Insurance

This is where EVs still tend to lose. Recent UK insurance guides show the average EV premium sitting above the wider car-insurance market, and EV-specific guides still describe typical premiums as meaningfully higher than petrol equivalents.

The reason is not that EVs crash more. It is that they are often more expensive to repair when they do. Battery safety checks, specialist parts, and longer repair times all push claim costs up. That cost comes back to you through premiums.

The honest number here is a range, not a single magic figure. On the gentler end, the gap might be a little over £100 a year. On tougher private-buyer examples, it can be £200 to £300 or more. That does not automatically wipe out fuel savings, but it absolutely eats into them.

This is also the line item most likely to blow up any generic article, because your postcode, age, and claims history matter more here than they do almost anywhere else. Get a quote before you buy. Not after.

Cost 3: Road Tax

This is one area where dated articles can now mislead you badly, because the rules changed in stages.

From 1 April 2025, EVs lost their VED exemption. From 1 April 2026, the standard annual rate is now £200, not last year's £195. So for most cars, EV and petrol are now broadly level on this line.

The expensive-car supplement changed too. From 1 April 2026, the supplement rises to £440 a year, but the threshold for zero-emission cars also rises to £50,000. That means a lot of mid-market EVs dodge a charge that was catching them under the older £40,000 threshold.

The practical takeaway is simple: for cars under £50,000, road tax is mostly a level playing field again. For EVs above £50,000, add the supplement. For articles still quoting a blanket £180 or £195 EV tax figure, check the date before trusting the rest of the page.

Cost 4: Servicing and Maintenance

This is one of the few genuinely straightforward EV wins. There is no oil change, no exhaust, fewer friction-brake replacements, and fewer moving parts in the drivetrain. That means lower routine maintenance bills in normal ownership.

The savings are real, but they are not miraculous. Reasonable 2026 guide figures put routine servicing at roughly £165 a year for an EV and around £205 to £240 for petrol depending on use. That is a useful saving over three years, but it is not the number that decides the whole ownership case.

The catch is obvious and worth stating plainly: specialist EV failures outside warranty can be ugly. Battery and motor issues are rare compared with routine servicing, but if they happen after warranty, the bill can be large. That risk is why routine service savings should be treated as a modest plus, not a full answer.

Cost 5: Tyres

This is the hidden extra that many EV cost articles quietly ignore. Fleet data from Epyx in late 2025 found the average electric company-car tyre at £246 versus £187 for an ICE equivalent. It also found the first tyre change happening at around 14,352 miles for EVs versus 18,333 miles for ICE cars.

That matters because it turns tyres from a vague warning into an annual cost line. Annualised using those figures, a 10,000-mile driver is looking at roughly £686 a year in EV tyre cost versus £408 for petrol. At 15,000 miles, the gap widens further.

This does not mean every EV eats tyres. Driving style, wheel size, and model matter. But it does mean tyre cost belongs in any honest EV ownership comparison, especially for heavier or more powerful cars.

Cost 6: Depreciation

This is the editorial centre of the article, because it is the biggest number and still the most underreported one.

The awkward truth is that broad fuel-type averages do not help much here. Model choice matters more. Motorway's guide still shows some strong-resale EVs holding up well: the Tesla Model 3 loses a little over 40% in three years and the Polestar 2 about 42%. That is not apocalypse-level depreciation. It is ordinary expensive-car depreciation.

But that does not mean depreciation has stopped being the danger. It means the risk has become more model-specific. Buy an EV with strong demand and the ownership case can work. Buy one with weak residuals, and you can lose more money on resale than you save on fuel.

This is why "EVs are cheaper to run" is such a slippery sentence. They can be. But a driver saving £1,000 a year on fuel and losing several thousand more on resale is not actually ahead. Depreciation is the number that can reverse the whole story.

The Full Picture: Three Driver Profiles

These are worked examples, not universal promises. The point is to show how the answer changes when the charging pattern, insurance risk, mileage, and depreciation profile change.

All three use the same fuel benchmark of 152.83p/litre at 40 mpg. EV efficiency is set at 3.5 mi/kWh. Tax uses the current 1 April 2026 VED rates. Depreciation is based on explicit three-year value-loss assumptions, because that is the line that decides most outcomes.

Profile 1: Suburban commuter, 10,000 miles, driveway, overnight charging

This is the EV-friendly case: a strong home-charging setup and a reasonably well-chosen EV with solid resale.

This is the clean EV win. Even after higher insurance, pricier tyres, and extra depreciation, the cheap energy makes the EV around £1,575 cheaper over three years.

Profile 2: Urban driver, 8,000 miles, no driveway, mixed public charging

This profile uses a public-charging mix of roughly 70% slower charging at 54p/kWh and 30% rapid charging at 76p/kWh. That lands the EV at almost the same per-mile energy cost as petrol, which is exactly where the non-fuel lines start to matter.

This is the petrol win the average EV article tends to pretend does not exist. The fuel saving is basically gone, insurance is higher, tyre cost is higher, and weaker depreciation does the real damage.

Profile 3: Rural driver, 15,000 miles, some home charging, frequent long trips

This profile assumes 70% charging at the standard home rate and 30% rapid charging for longer journeys. It also assumes a relatively strong-resale EV rather than a weak one, because that is the difference between "high-mileage EV win" and "expensive mistake".

Higher mileage helps the EV, but only because the fuel saving is large enough to matter and the depreciation assumption is not disastrous. Change the car to a weaker-resale EV and this profile can flip the other way.

The Company Car Tax Exception

If you are a company car or salary sacrifice driver, you should read the rest of this article and then mentally put a box around it. For you, the tax treatment can overwhelm almost every private-buyer cost line above.

For 2026/27, the Benefit-in-Kind rate for a zero-emission company car is 4%. On a £40,000 EV, that is a taxable benefit of £1,600, which means a basic-rate taxpayer pays about £320 a year. A petrol car taxed at 30% BIK creates a £12,000 benefit, or about £2,400 a year for the same taxpayer.

That difference is massive. It is the single clearest 2026 reason many employed drivers go electric. It is also why private-buyer EV articles can feel misleading when they borrow company-car talking points without saying so.

If that is your route, start with our company car guide. If you are buying privately, most of the decision still rests on the six lines above.

When Petrol Still Wins

• Low-mileage private buyers with no cheap charging: if your annual mileage is small, the fuel saving is too weak to rescue the rest of the numbers.
• Drivers relying heavily on rapid public charging: at 76p/kWh, the per-mile energy cost can be worse than petrol.
• Buyers choosing weak-resale EV models: this is where the cheap-to-run story can collapse under depreciation.
• Used-budget buyers: a sound £5,000 to £8,000 petrol car can still beat a much pricier used EV on total outlay.
• Drivers who tow regularly or need simple long-distance flexibility: even if the spreadsheet looks close, the practical downside may still push you back to petrol.

Sources and Assumptions

External references: RAC Fuel Watch, Ofgem, Octopus Energy, E.ON Next, Zapmap, Brumble, Electric Car Scheme, Epyx, Motorway, GOV.UK vehicle tax guidance, HM Treasury expensive-car threshold update, and HMRC company car tax rates.

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