Electric vs Petrol Cars: Full Cost Comparison for 2026

Electric vs Petrol Cars: The Complete UK Cost Comparison

The electric vehicle revolution is well underway in the UK, but deciding whether to switch from petrol involves far more than just environmental considerations. This guide provides a comprehensive, numbers-driven comparison to help you make the right decision for your circumstances, using real 2025/26 figures.

Purchase Price Comparison

Electric vehicles (EVs) remain more expensive to buy than equivalent petrol models, though the gap is narrowing:

| Category | Petrol Example | Price | EV Equivalent | Price | |----------|---------------|-------|---------------|-------| | Small car | Vauxhall Corsa 1.2 | ~£20,000 | Vauxhall Corsa Electric | ~£28,000 | | Family hatchback | VW Golf 1.5 TSI | ~£28,000 | VW ID.3 Pro | ~£33,000 | | SUV | Nissan Qashqai | ~£28,000 | Nissan Ariya 63kWh | ~£37,000 | | Premium | BMW 3 Series | ~£42,000 | BMW i4 eDrive35 | ~£47,000 |

The premium is typically £5,000 to £10,000, but this is offset by lower running costs over time.

Running Costs: Fuel vs Electricity

Petrol Costs

• Average UK petrol price: approximately £1.35 per litre (early 2026)
• Average petrol car efficiency: ~45 mpg (6.3 litres per 100km)
• Cost per mile: approximately 18–20p

Electricity Costs (Home Charging)

• Average UK electricity tariff: approximately 28p per kWh (Ofgem price cap, Q1 2026)
• Average EV efficiency: ~3.5 miles per kWh
• Cost per mile: approximately 7–8p
• With an off-peak EV tariff (e.g., Octopus Go at ~7.5p/kWh): approximately 2p per mile

Public Charging

• Rapid chargers: typically 50–79p per kWh (cost per mile: 14–23p)
• On-street slow chargers: typically 30–45p per kWh

For 10,000 miles per year:

• Petrol: approximately £1,800–£2,000
• EV (home charging, standard tariff): approximately £700–£800
• EV (home charging, off-peak tariff): approximately £200–£250
• EV (mostly public charging): approximately £1,400–£2,300

Servicing and Maintenance

EVs have far fewer moving parts — no engine oil, no clutch, no exhaust system, no timing belt:

• Petrol car annual service: £200–£500
• EV annual service: £100–£200
• Brake replacement is less frequent on EVs due to regenerative braking
• EV tyres wear slightly faster due to the extra weight and instant torque — budget around 10–15% more

Over five years, expect to save approximately £1,500 to £3,000 on maintenance with an EV.

Insurance Comparison

EV insurance has historically been higher due to expensive battery repairs and fewer specialist mechanics, though the gap is closing:

• Average EV insurance premium: approximately £700–£1,000 per year
• Average petrol car premium: approximately £500–£750 per year
• Difference: roughly £150–£300 per year more for an EV

Road Tax (VED) 2025/26

• Petrol cars — first-year rate based on CO2 emissions (£0–£2,745), then standard rate of £190/year, plus £410 expensive car supplement if the car listed over £40,000
• EVs (registered before April 2025) — £0/year
• EVs (registered from April 2025) — £10 first year, then £190/year standard rate. The expensive car supplement also applies to EVs over £40,000

This is a significant change — EVs are no longer VED-exempt for new registrations.

Depreciation Comparison

Depreciation is typically the largest cost of car ownership:

• Petrol cars — approximately 50–55% depreciation over 3 years, 60–65% over 5 years
• EVs — historically depreciated faster, but this has stabilised significantly. Expect approximately 45–55% over 3 years for popular models like Tesla Model 3, with older/less desirable EVs still depreciating more

Popular EVs with strong residuals: Tesla Model 3, Tesla Model Y, BMW iX1, Hyundai Ioniq 5.

Total Cost of Ownership Comparison

Example: Family hatchback, 10,000 miles/year, home charging

| Cost Element | Petrol (VW Golf) over 5 years | EV (VW ID.3) over 5 years | |-------------|-------------------------------|----------------------------| | Purchase price | £28,000 | £33,000 | | Depreciation (55%) | £15,400 | £16,500 | | Fuel/electricity | £9,500 | £3,750 | | Insurance | £3,500 | £4,500 | | Servicing | £2,000 | £750 | | Road tax | £950 | £770 | | Total cost | £31,350 | £26,270 |

Even with the higher purchase price, the EV works out roughly £5,000 cheaper over five years. The savings increase with higher mileage and when using off-peak charging tariffs.

Charging Infrastructure

Home Charging

• 7kW wallbox installation — approximately £800–£1,200 installed
• Charges a typical EV from 10% to 80% in 6–8 hours (overnight)
• Approximately 80% of UK EV charging happens at home
• If you can't charge at home, an EV becomes significantly less convenient and more expensive

Public Network

• Over 65,000 public charge points across the UK (as of early 2026)
• Rapid chargers (50kW+) are widespread along motorways and A-roads
• Ultra-rapid chargers (150–350kW) can add 100+ miles in 15–20 minutes
• Network reliability has improved significantly — apps like Zapmap help find working chargers
• Coverage is good on major routes but can be patchy in rural areas

Range Anxiety: The Reality

Modern EVs have largely solved range anxiety for daily use:

• Most new EVs offer 200–300+ miles of real-world range
• The average UK car journey is just 20 miles
• 99% of daily driving needs are comfortably within EV range
• Long journeys require planning around charging stops (typically 20–30 minutes every 150–200 miles)

Cold weather reduces range by roughly 15–25% — worth factoring in for winter journeys.

Battery Degradation Facts

• Most EV manufacturers warranty batteries for 8 years or 100,000 miles
• Real-world data shows most batteries retain 85–90% of original capacity after 100,000 miles
• Tesla batteries have shown particularly strong longevity — many retain over 90% after 200,000 miles
• Battery replacement costs are falling: currently £5,000–£15,000 depending on the vehicle

Company Car BIK Rates (2025/26)

This is where EVs offer the most dramatic financial advantage:

• Battery electric vehicles — 2% BIK rate (rising to 3% in 2026/27, 4% in 2027/28, then 7% by 2029/30)
• Petrol cars — 20% to 37% BIK depending on CO2 emissions

Example on a £40,000 car for a 40% taxpayer:

• EV: £40,000 × 2% × 40% = £320/year in tax
• Petrol (30% BIK): £40,000 × 30% × 40% = £4,800/year in tax

That's a saving of £4,480 per year — making EVs extraordinarily attractive as company cars.

Environmental Comparison

• Over its lifetime, an EV produces approximately 50–70% fewer CO2 emissions than an equivalent petrol car, including manufacturing
• Battery manufacturing does have a carbon cost, but this is "paid back" within roughly 1–2 years of driving
• As the UK grid continues to decarbonise, the lifetime emissions advantage of EVs grows

When Petrol Still Makes Sense

An EV might not be right for you if:

• You cannot charge at home and rely entirely on public charging
• You regularly tow heavy loads (EV range drops dramatically when towing)
• You drive extremely high miles on motorways with limited charging infrastructure
• You're buying a very cheap used car (sub-£5,000 budget)
• You need a specialist vehicle type not yet available as an EV

Making the Switch: Your Checklist

1. Can you charge at home? This is the single most important factor
2. Assess your daily mileage — is it within comfortable EV range?
3. Calculate your total cost of ownership using our car cost calculator
4. Check company car BIK if it's a company vehicle — the savings are huge
5. Research available models in your budget and needs
6. Test drive multiple EVs — the driving experience is notably different
7. Get home charger quotes — factor this into your budget
8. Switch to an off-peak electricity tariff for maximum savings
9. Consider the used EV market — excellent value from 2–3-year-old vehicles
10. Make the switch — most EV owners say they'd never go back