EV vs Petrol vs Diesel: The Real 5-Year Cost of Ownership (UK & EU, 2026)

Two neighbours buy the same week, the same budget, the same commute. One picks a £30,000 electric hatchback and charges it overnight; the other picks a £28,000 petrol equivalent. Five years and 50,000 miles later the petrol driver has spent close to £7,000 more — and almost none of it was the sticker price.

By Petra Halvorsen, Energy & E-Mobility Cost Analyst · Published 17 June 2026 · Figures current to Q2 2026

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The argument about whether an electric car is "cheaper" has been stuck for years on the wrong number. People look at the windscreen price, see a few thousand pounds of difference, and stop. The windscreen price is the one part of car ownership that an electric drivetrain barely touches — and, as of April 2026, the part where the gap has all but vanished. The average new electric car in the UK now sells for £42,620, fractionally below the average new petrol car at £43,405; Auto Trader called it the first time EVs had been cheaper on average, the result of cheaper batteries and sustained discounting [20].

So the honest question is not "is the EV cheaper to buy" but "what does each of these cars cost to keep". That answer lives in six lines: fuel or energy, road tax, servicing, insurance, depreciation, and the purchase itself. Five of those six move when you switch from a tank to a battery, and they move in different directions. This piece works through every line with 2026 prices, builds a five-year total, and then says plainly where petrol and diesel still make the better financial case — because for some drivers they do.

The number that actually matters

A car's true cost is what leaves your account over the time you own it, divided by the miles you drive. For the representative pair in this article — a £30,000 home-charged EV, a £28,000 petrol car, a £29,000 diesel, each driven 10,000 miles a year for five years — the five-year running totals land at roughly £27,020 for the EV (about £24,750 if you charge on a smart overnight tariff), £31,720 for the petrol car, and £32,620 for the diesel. That is a £4,700 to £6,970 advantage for electric over petrol, and a little more over diesel, before any subsidy. Per mile, the EV runs at about 54p against 63p for petrol and 65p for diesel.

Those totals include depreciation, which is the real cost of the car's value falling, and exclude the purchase price itself so the same pound is not counted twice. Every figure is our own calculation from sourced unit prices, and the full assumptions sit in the methodology. The point of leading with the total is to set expectations correctly: the EV's win is real but it is measured in roughly a thousand pounds a year, not the "fuel for free" fantasy of the early adopters or the "they cost a fortune" reflex of the sceptics. It is a steady, structural saving, and where it comes from is more interesting than the headline.

Independent studies land in the same territory. The European consumer group BEUC, in a September 2025 lifetime-cost study, concluded that battery cars are already the cheapest option for used-car buyers and become the cheapest new medium car from 2026, and that any new EV sold today saves its second or third owner between €262 and €849 a year against a petrol equivalent [24]. The UK's Energy and Climate Intelligence Unit has put the running-cost gap near £700 a year. The numbers here are a touch wider because they include a smart-tariff scenario, but the direction is unanimous.

The purchase price gap just closed

For a decade the electric premium was the whole story: it is now close to a rounding error, and in parts of the market it has flipped.

The mechanism is battery cost. BloombergNEF tracked average pack prices at $112 per kWh in 2025, down from $166 in 2022 and $806 back in 2013 [22]. A battery is the most expensive component in an EV, so when it falls by a factor of seven over twelve years the price of the whole car follows. BNEF's modelling had electric saloons and SUVs reaching production-cost parity with petrol from 2026 and the smallest cars by 2027 [23]. That timeline has arrived more or less on schedule.

You can see it on individual price lists. A Tesla Model 3 starts at £37,990 in 2026; a comparable BMW 3 Series saloon starts higher, at £41,945 [17][18]. At the budget end, the MG4 opens at £22,729, undercutting most petrol family hatchbacks of similar size [19]. The market-wide average tells the same story: £42,620 for a new EV against £43,405 for petrol [20]. The era when going electric meant paying a five-figure premium for the privilege is over for mainstream cars, though it persists at the luxury end and for a handful of models without a direct petrol twin.

Used cars are the more dramatic chapter. After a brutal two-year reset — driven by Tesla's price cuts and a flood of ex-fleet stock — used EV values have rebounded hard. Auto Trader's April 2026 index showed the average used electric car at £23,555, up 3% on the month, while used petrol slid to £14,988 and used diesel to £14,597; demand for used EVs was up 59% year on year, and three-to-five-year-old EVs were the fastest-selling cars on the forecourt [21]. That recovery matters for the most important and least predictable line of all, depreciation, which I will come back to.

Fuel versus energy: the line where the EV wins biggest

This is the line that does most of the work, and it is worth being precise about it, because it is where the marketing on both sides gets sloppy.

Start with petrol and diesel. In mid-June 2026 the UK average pump price was 155.5p a litre for unleaded and 176.7p for diesel [1]. Those numbers had spiked higher earlier in the month, to 158.7p and 184.1p, after disruption around the Strait of Hormuz pushed up crude — a reminder that fuel prices carry a geopolitical tax that electricity from a domestic grid largely does not [2]. Across the EU the picture is dearer still: the European Commission's Weekly Oil Bulletin had the bloc averaging about €1.85 a litre for petrol and €1.87 for diesel in late May [4]. A large part of every litre is tax: UK fuel duty sits at 52.95p, with the temporary 5p cut now extended to the end of December 2026, and then 20% VAT on top [3][16].

A real-world petrol family car returning 45 mpg therefore costs about 15.7p a mile to fuel; a 55 mpg diesel about 14.6p. (What Car?'s True MPG testing shows mainstream petrol and diesel models landing in that band, with new cars averaging around 5% below their official figures [5].) Over 50,000 miles that is £7,850 of petrol or £7,300 of diesel.

Now the EV. At the Ofgem price-cap rate for the third quarter of 2026 (26.11p per kWh) and a real-world 3.6 miles per kWh, home charging costs about 7.3p a mile, or £3,630 over the five years [6]. Shift that charging to a smart overnight tariff and the figure collapses: Octopus's Intelligent Octopus Go schedules charging at 8p per kWh, which works out near 2.7p a mile and around £1,360 across five years [7]. Charge mostly at home, in other words, and the EV's fuel bill is somewhere between a third and a sixth of the petrol car's.

There is an important exception, and ignoring it is the single most common mistake in EV cost articles. If you cannot charge at home and rely on public rapid chargers, the maths changes completely. The UK weighted-average rapid price is about 79p per kWh — pushing the EV's fuel cost to roughly 21.9p a mile, more than either petrol or diesel [28]. Public charging carries 20% VAT against 5% on domestic electricity, which bakes in part of that gap [16]. The RAC's own analysis finds public charging still beats petrol for most drivers on a typical home-and-public mix [34], but the driver with no driveway, charging exclusively in public, is the one case where an EV can genuinely cost more to fuel than the car it replaced. The fuel-cost win is real, but it belongs to people who can plug in where they sleep.

Tax: the gap Westminster narrowed

For years the tax system did half the work of selling electric cars: in April 2025 it stopped doing quite so much.

Until then EVs paid no Vehicle Excise Duty at all. From 1 April 2025 that exemption ended: a new electric car now pays a token £10 in its first year, then the standard rate (£195, rising to £200 for cars taxed from April 2026) every year after, the same as a petrol or diesel car [14]. Over five years that is roughly £790 for the EV against about £1,320 for an internal-combustion car whose higher-emission first-year rate is steeper. The road-tax advantage shrank from "total exemption" to "a few hundred pounds", and any 2026 cost comparison that still shows EVs paying zero VED is out of date.

There is a sting in the tail for pricier EVs. The Expensive Car Supplement, an extra £425 a year (£440 from April 2026) for five years on top of standard VED, now applies to electric cars, but with a higher threshold of £50,000 against £40,000 for petrol and diesel [14]. So a £38,000 EV escapes it while a £42,000 petrol car pays roughly £2,100 over five years that the EV does not. Cross £50,000 in an EV, though, and you are caught too.

Where the tax gap stays enormous is the company car. Benefit-in-Kind rates for a zero-emission car are 3% for 2025/26, 4% for 2026/27 and 5% for 2027/28, against up to 37% for petrol and diesel [15]. For anyone choosing through a salary-sacrifice or company scheme, that difference dwarfs everything else in this article and is the main reason fleet and business demand has driven the UK EV market. The same logic runs across Europe: Germany keeps electric cars exempt from annual vehicle tax through 2030 and lifted the list-price cap for its favourable 0.25% company-car rule from €70,000 to €100,000 [29], while France taxes the benefit of an electric company car at a reduced rate and is ratcheting up a corporate EV purchase quota toward 2030 [30].

Servicing, tyres and the things that break

An electric drivetrain means far fewer things to maintain: it has a few dozen moving parts where a combustion engine has several hundred, with no oil to change, no filters or spark plugs, no timing belt, no clutch, no exhaust or turbo. Regenerative braking means the friction brakes do far less work, so pads and discs last longer. The savings are measurable rather than theoretical.

The US Department of Energy, drawing on Argonne National Laboratory modelling, puts scheduled maintenance at 6.1 cents a mile for a battery EV against 10.1 cents for a comparable petrol car, about 40% lower [10]. Consumer Reports, using owner-reported data, found EV drivers spend roughly half as much on maintenance and repair over a vehicle's life, around 3 cents a mile versus 6 [11]. In UK terms an EV service starts around £228 at a national chain, with fewer consumables to replace each year [12]. Applying that 40–50% saving to a typical UK servicing budget gives roughly £1,250 over five years for the EV against £2,250 for petrol and £2,400 for diesel, the diesel costing a little more thanks to particulate filters and AdBlue systems.

Two honest caveats. EVs are heavy and quick, so they can go through tyres faster, which eats into the saving for hard drivers. And the items that do fail on an EV — anything involving the high-voltage system — are expensive and need a qualified technician, so the distribution of costs is flatter and cheaper but with a fatter tail. For most owners doing most miles, the servicing line is a clear and recurring EV win.

Insurance: the line where petrol still wins

Here the electric car loses, and pretending otherwise would be dishonest: electric cars have been more expensive to insure, for reasons that are real. A battery pack can represent up to 40% of a car's total value, so even a moderate shunt can write the car off; Thatcham Research found battery damage concerns cited by 44.6% of insurers and 41.7% of repairers as a write-off driver, and has been pushing an "EV Blueprint" specifically to stop repairable cars being scrapped [13]. Fewer trained technicians and pricier parts pushed early EV premiums well above petrol equivalents.

The gap, though, is closing fast. It stood around 25–30% above comparable petrol cars at the 2023–2024 peak and has narrowed to roughly 10–15% by 2026 as specialist insurers priced the risk on real claims data and repair costs came down — Thatcham logged a 10.7% fall in EV repair costs [13][31]. For the five-year model I have assumed the EV runs about 12% dearer to insure: roughly £3,950 against £3,500 for petrol and £3,600 for diesel. It is the one line where switching to electric reliably costs you more, and it offsets perhaps a tenth of the fuel saving. Worth knowing, not worth losing sleep over, and shrinking every year.

Depreciation: the wildcard that swings everything

Depreciation is the largest single cost of owning almost any new car, far bigger than fuel, and it is the line I trust least.

The reason for the caution is recent history. Used EV prices fell off a cliff in 2023 and into 2024 as Tesla cut new prices and ex-lease cars flooded the market, then rebounded sharply through 2025 and 2026 as demand caught up with supply [21]. A residual-value forecast made in 2024 would have been badly wrong by 2026 in both directions. So the depreciation figures in the comparison table — about £17,400 for the EV, £16,800 for petrol, £18,000 for diesel over five years — are modelled, deliberately close to one another, and flagged as the most uncertain numbers here.

What the 2026 data does say is encouraging for EVs. The recovery in used electric values has been strong enough that Auto Trader recorded the average used EV at £23,555, well above used petrol and diesel, with EVs selling faster than either [21]. Diesel is the quiet loser of this story: used diesel values fell more than 18% year on year as buyers anticipated clean-air zones and tightening rules, which is why the diesel depreciation line is the steepest of the three [21]. If used EV demand holds, depreciation moves from being electric's historic weakness toward a neutral or favourable line, and the five-year totals shift further in the EV's favour. If it does not, this is where the case is most exposed. Either way, the number to watch is the residual value, not the fuel bill.

Every line in one place

Stacking the six lines together is the only way to see the shape of the decision. The table below is the whole argument in one view: the EV wins fuel by a mile, wins tax and servicing comfortably, loses insurance, and fights depreciation to roughly a draw.

5-year cost line (UK)	Electric (home-charged)	Petrol	Diesel
List price, new (C-segment)	£30,000	£28,000	£29,000
Fuel / energy	£3,630 (£1,360 smart tariff)	£7,850	£7,300
Road tax (VED)	£790	£1,320	£1,320
Servicing & maintenance	£1,250	£2,250	£2,400
Insurance	£3,950	£3,500	£3,600
Depreciation (modelled)	£17,400	£16,800	£18,000
5-year running total (incl. depreciation)	£27,020 (£24,750 smart)	£31,720	£32,620
Cost per mile	54p (50p smart)	63p	65p

Read the grouped chart and one pattern jumps out. The EV's advantage is not one big saving but three steady ones — energy, tax and servicing — that compound over the miles, partly given back through insurance. The more miles you drive and the more of your charging you do at home, the wider the gap opens, because fuel is the line that scales with mileage. A 6,000-mile-a-year second car shows a much smaller EV advantage than a 15,000-mile commuter, which is exactly why the break-even point depends so heavily on how you actually use the car.

Break-even: when does the EV pull ahead?

If the EV and the petrol car cost the same to buy, the EV is ahead from the first mile, because every mile is cheaper to fuel and most years are cheaper to tax and service. The interesting case is when the EV still costs more up front, which is common for like-for-like premium models or for anyone comparing a new EV against a cheaper used petrol car.

The crossover maths is simple. Take the fuel saving alone: a home-charging EV saves roughly 8p a mile against petrol on the standard rate (15.7p minus 7.3p), or about 13p a mile on a smart tariff. A £3,000 purchase premium is therefore repaid in about 37,000 miles on the standard rate, or under 24,000 miles on a smart tariff — under three years for an average driver, faster for a high-mileage one. Add the tax and servicing savings and the break-even comes sooner still. The driver for whom an EV never breaks even is the low-mileage, public-charging-only owner who paid a premium up front, which is the specific combination to avoid.

How far you drive decides the answer

Put real mileages on it. A 15,000-mile-a-year commuter in the home-charging EV spends about £1,090 a year on electricity at the cap rate, or roughly £410 on a smart overnight tariff; the equivalent petrol driver spends about £2,355 at June 2026 pump prices [1][6][7]. Over five years that single line is a gap of more than £6,000 before tax, servicing or insurance is counted, which is why high-mileage drivers see the fastest payback and the widest lifetime saving. Halve the mileage and the picture softens: a 6,000-mile-a-year second-car owner spends roughly £435 a year on home electricity against £940 on petrol, a five-year fuel gap nearer £2,500 that a purchase premium can easily swallow. The cars did not change; the mileage and the charging did, and that is what moved the answer.

One cost sits outside every line above: financing. Most new cars are bought on PCP or hire purchase, and interest depends on the deal rather than the powertrain, so the tables here leave it out. It matters only at the premium end, where a higher EV list price means a slightly larger sum is financed; a like-for-like comparison there should run the interest on each car's actual price rather than assume it cancels out. At mainstream prices, where electric and petrol now cost about the same to buy [20], the difference is negligible.

Where petrol or diesel still makes sense

A cost site that only ever reaches one conclusion is not worth reading, so here is the honest other side. Petrol or diesel can still be the better financial choice if you cannot charge at home and would rely on public rapid charging, where an EV's running cost can exceed petrol's [28]. It can win if you drive very few miles a year, so the fuel saving never repays any purchase premium. Diesel in particular still makes sense for high-mileage towing and long motorway runs where its real-world economy and range are hard to match and where you keep the car long enough to ride out its weaker residuals. And anyone buying a cheap, already-depreciated used petrol car for a short hold is comparing against a very different cost base than the new-car maths above.

For the large middle of the market, though — a driver doing average miles, with somewhere to plug in, keeping the car a few years — the five-year arithmetic favours electric, and it has only moved further that way as battery and used-car prices have settled.

The European picture

The UK is not unusual here. BEUC's nine-country study found battery cars already the cheapest lifetime option for medium new cars across the EU from 2026, with the second-hand saving for downstream owners worth hundreds of euros a year [24]. The structural drivers are the same everywhere: electricity is cheaper per mile than refined fuel, EVs need less maintenance, and most national tax systems still tilt toward zero-emission cars even where, as in the UK, the most generous breaks have started to taper.

Demand reflects it. Battery-electric cars reached 19.7% of EU new-car registrations across early 2026, up sharply from a year earlier, while in the UK the figure hit 26.2% in April and the two-millionth electric car was registered that spring [25][26].

The market has, in effect, already voted with the total-cost number rather than the sticker price. The job of an article like this is to show why that vote makes arithmetic sense for most buyers, and where it does not.

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Methodology & assumptions

Scope. A five-year, 50,000-mile window (10,000 miles a year) for a single mainstream C-segment class in three powertrains, bought new, UK-focused with a European cross-check. All prices are gross (including VAT and taxes). Currency is sterling unless a figure is shown in euro.

Sourced vs calculated. Unit prices are sourced and dated: pump prices from the gov.uk weekly series and RAC Fuel Watch [1][2]; the domestic electricity unit rate (26.11p/kWh) from the Ofgem cap for 1 July–30 September 2026 [6]; the smart rate (8p/kWh) from Octopus Intelligent Octopus Go [7]; fuel duty and VAT from HMRC [3][16]; vehicle tax from the gov.uk rate tables [14]. Every five-year total, per-mile figure and the comparison table is our own calculation from those inputs.

Assumptions. EV efficiency 3.6 mi/kWh (European real-world average 21 ± 4 kWh/100 km, ~3.0 mi/kWh [33]; RAC models 3.5 [9]; 3.6 absorbs typical charging losses). Petrol 45 mpg, diesel 55 mpg, consistent with What Car? testing [5]. Maintenance applies the 40–50% EV saving measured by DOE/Argonne and Consumer Reports to a UK servicing base [10][11]. Insurance uses the 2026 EV-vs-petrol premium gap of ~10–15% from UK comparison indices [31].

Flagged uncertainty. Depreciation is modelled, not measured, and is the most volatile line — UK residuals for all three fuels moved sharply in 2024–2026 [21]. Insurance averages come from comparison-site indices, not a regulator, and are corroboration. Public rapid-charging cost (79p/kWh [28]) is shown as the worst case for an EV with no home charging. Charging losses of roughly 10% are partly absorbed in the efficiency assumption rather than itemised.

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Frequently asked questions

Is an EV really cheaper than petrol over five years? For a typical home-charging driver doing average miles, yes. Our five-year model puts the EV around £4,700–£6,970 cheaper than petrol and a little more than diesel, driven mainly by fuel, tax and servicing [1][6][10]. Independent studies (BEUC, ECIU) reach the same conclusion [24].

What if I can't charge at home? That is the case where the EV can lose. Relying on public rapid charging at about 79p per kWh pushes the EV's fuel cost above petrol's, because public charging carries 20% VAT against 5% at home [28][16]. Without home or workplace charging, run the numbers carefully before switching.

Has the end of the EV road-tax exemption changed the maths? A little, not a lot. From April 2025 EVs pay VED like any car — about £790 over five years against roughly £1,320 for an internal-combustion car [14]. It trimmed the EV's advantage by a few hundred pounds; the fuel saving still dwarfs it.

Are EVs more expensive to insure? Usually still a bit — around 10–15% more in 2026, down from 25–30% a couple of years ago as the gap narrows [31]. Higher repair and battery-replacement costs are the reason, and they are falling [13].

Is diesel ever the cheaper choice now? For very high mileage, long motorway runs or towing, diesel's real-world economy and range can still win, especially on a longer ownership term. But used diesel values are falling fastest of the three, which erodes that case [21].

Does the purchase price still favour petrol? No longer, on average. New EVs sold for £42,620 against £43,405 for petrol in April 2026, the first time EVs were cheaper on average, as battery costs fell to $112/kWh [20][22].

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About the author

Petra Halvorsen is ChargeCostLab's Energy & E-Mobility Cost Analyst. She covers European retail power markets and electric-vehicle running costs for ChargeCostLab, reconciling regulator data, tax tables and charging-operator tariffs into figures drivers can act on. She takes no payment from carmakers, charging networks or energy suppliers, and every calculation here is reproducible from the cited primary sources.

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Sources

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© 2026 ChargeCostLab. Independent EV running-cost analysis. Figures reflect data available to Q2 2026 and will change as tariffs, fuel prices and residual values move. Informational, not financial advice. Last reviewed 17 June 2026.