EV vs Petrol in the UK 2026 — True 5-Year Total Cost of Ownership

The sticker price of an electric car still makes most UK drivers wince: a Tesla Model 3 Long Range costs £49,000, while a comparable petrol Volkswagen Passat costs £31,000. The gap seems insurmountable until you factor in fuel, maintenance, and resale value. Over 5 years, the economics flip. We'll walk through real 2026 numbers to see whether switching to electric saves money or costs more.

TCO Comparison: Mid-Range Family Car

Winner: EV saves £4,725 (17%) over 5 years, or roughly £945/year.

Real-World Example: London-Based Family, 12,000 Miles/Year

Meet James, 42, living in North London. He does 12,000 miles/year (a mix of commute, school runs, and weekend trips). He's considering trading in his 2021 Passat (current value £20,000) for a new Tesla Model 3 Long Range.

Purchase:

• New EV: £49,000
• Trade-in credit (existing car): –£20,000
• Net cash outlay: £29,000

Fuel cost comparison over 5 years (60,000 miles):

• EV: Model 3 LR averages 25–30 miles per 10 kWh (UK EPA equivalent). At 28p/kWh home charging (2026 average), that's 9.4p/mile × 60,000 = £5,640
• Petrol: Passat does ~45 mpg combined. Petrol at £1.35/litre = 12p/mile × 60,000 = £7,200
• EV fuel advantage: £1,560 over 5 years

Maintenance:

• EV: No oil changes, fewer brake services (regenerative braking extends pad life to 150k+ miles), one cabin air filter. Total: ~£1,000 over 5 years (just tires and pads).
• Petrol: Oil changes (£150 × 3), air/cabin filters (£200), brake fluid top-ups, eventual exhaust/emission work. Total: ~£3,500.
• EV maintenance advantage: £2,500

Insurance:

• EV: £550/year (higher due to expensive battery replacement risk, but improved safety ratings offset this).
• Petrol: £450/year.
• EV insurance cost: +£500 over 5 years

Road tax (VED):

• EV: £0 (full exemption for electric cars registered after April 2017).
• Petrol: £165/year (standard) = £825 over 5 years.
• EV VED advantage: £825

Home charging installation:

• EV: One-time cost for a 7 kW wallbox: £500–£1,000 (average £750). Amortized over 5 years: £150/year = £750 total.
• Petrol: N/A.
• EV charging cost: £750

Depreciation (5 years):

• EV Model 3 LR: Bought at £49,000 → £26,950 retained (55%) → loss of £22,050.
• Petrol Passat: Bought at £31,000 → £18,600 retained (60%) → loss of £12,400.
• EV depreciation cost: +£9,650 worse

5-year total cost:

• EV: £29,000 (net purchase) + £5,640 (fuel) + £2,750 (insurance) + £1,000 (maintenance) + £750 (charging) – £26,950 (trade-in) = £11,190 net cost
• Petrol: £31,000 (purchase) + £7,200 (fuel) + £2,250 (insurance) + £3,500 (maintenance) + £825 (tax) – £18,600 (trade-in) = £26,175 net cost
• EV advantage: £14,985 (57% cheaper)

Wait—that's a much bigger gap than the table above. The difference is James is trading in an existing car, not buying outright.

Corrected comparison (purchase price only):

• EV net outlay after trade-in: £29,000
• Petrol net outlay: £0 (he owns his current car)
• Running costs (fuel + maintenance + insurance + tax) over 5 years: EV £9,140 vs Petrol £11,775
• EV still saves £2,635 in running costs alone

The Depreciation Wildcard

EV resale value is volatile. In 2020–2022, used EVs held value extremely well because new car prices were inflated and supply was constrained. In 2024–2025, EV prices fell 20–30%, crushing used values. A Model 3 bought at £49,000 in 2021 is now worth ~£22,000–£26,000 (45–53% retained), not the 65–70% that petrol cars hold.

Why?

• Rapidly improving battery tech makes older EVs look obsolete (range, charging speed)
• New EVs are cheaper (Tesla cut prices 30% in 2024)
• Battery degradation concerns (a 10-year-old pack loses 5–15% capacity)
• Secondhand market smaller and less liquid

For TCO purposes: assume 55% retention for EVs, 60% for petrol, but check actual trade-in quotes before committing. An EV bought today might depreciate faster than a petrol car if the market continues its 2024–2025 trend.

Charging Economics: Home vs Public

Home charging (best case):

• 7 kW wallbox installed: £500–£1,000
• Off-peak unit rate: 24–28p/kWh (varies by supplier, time-of-use tariff)
• Model 3 LR: ~25 miles per 10 kWh → 10.8p/mile
• 12,000 miles/year: ~4,800 kWh, cost = £1,200–£1,350/year

Public rapid charging (worst case, for long trips):

• BP Pulse, Pod Point, etc.: 40–60p/kWh
• Same Model 3: 40p/kWh → 16p/mile (60% more expensive)
• Occasional use (5–10% of miles on public chargers): effective cost ~11–12p/mile

Tesla Supercharging (intermediate):

• £0.28–£0.35/kWh (varies by location and time)
• Realistic TCO with 15% Supercharger use: ~12p/mile

Smart move: Charge at home on off-peak rates. Rare long trips via Supercharger or public rapid chargers. This yields 10–12p/mile vs petrol's 12–15p/mile.

The 12,000 Miles/Year Rule

The numbers above assume UK average mileage: 12,000 miles/year. If you drive more or less, the EV advantage shrinks or expands:

• 5,000 miles/year (low usage): EV depreciation matters more (fixed cost spread over fewer miles). Petrol wins slightly.
• 15,000 miles/year (typical company car): EV fuel savings balloon. EV wins by £6,000–£8,000 over 5 years.
• 25,000 miles/year (high usage): EV fuel savings huge, but depreciation risk increases if battery health drops. Toss-up; depends on EV model chosen.

Don't Forget Government Grants

The UK ended EV purchase grants in June 2022, replacing them with:

• Workplace Charging Scheme (WCS): £350/socket cap for employers installing 1–5 chargers at work. Employees don't get grants, but employers do.
• Grants for vans/taxis (still available, cars are not).

For personal car purchases, there are no grants. Scotland/Wales may have regional incentives; check before buying.

Tax Implications

• Benefit-in-kind (BiK) for company cars: EVs under £40,000 list price get 2% BiK rate (vs. 20%+ for petrol). A £49,000 Model 3 above threshold pays ~15% BiK, but a £35,000 used EV at 2% is a huge bargain for higher-rate taxpayers.
• No congestion charge: London ULEZ charges £12.50/day for petrol cars; EVs exempt. Over 5 years, that's £9,000+ saved if you're in London.
• VAT on home charger: 0% VAT on residential charger installation (5% on domestic goods). Not a tax saving per se, but cheaper than commercial install.

Scenario: 5-Year Breakeven

For James to truly break even over 5 years (ignoring depreciation), the fuel savings alone must offset the £18,000 price premium:

• EV fuel cost: 10p/mile
• Petrol fuel cost: 12p/mile
• Difference: 2p/mile
• 60,000 miles × 2p = £1,200 saved in fuel

Maintenance saving: £2,500

Total running cost saving: £3,700

Against a £18,000 price premium (£49k EV vs £31k petrol), the EV breaks even only on fuel + maintenance in 5 years if you drive very high mileage (20k+/yr) or depreciation favors EVs significantly.

However, include trade-in value (EV retains ~£26k, petrol ~£18.6k), and the EV ahead by ~£7,000. Depreciation risk is the swing factor.

Conclusion: Should You Switch?

EV wins if:

• You drive 12,000+ miles/year
• You can charge at home on off-peak rates
• You plan to keep the car 5+ years (depreciation matters less)
• You're in London/congestion zones (ULEZ saves £9k)
• You have a higher company car BiK rate (2% vs 20%+)

Petrol wins if:

• You drive <8,000 miles/year
• You can't install home charging (public charging is 50% more expensive)
• You're worried about EV depreciation (fair concern 2024–2025)
• You need to tow/go off-road regularly (poor EV range when towing)
• You drive to remote areas without charging infrastructure

Next step: Use the EV vs Petrol TCO calculator with your actual annual mileage, current insurance quotes, home electricity rate, and expected trade-in value. Most UK drivers averaging 12,000 miles/year save £3,000–£6,000 over 5 years by switching to electric.