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EV charging costs vs petrol and diesel

Home charging, public rapid charging and petrol compared on a pence-per-mile basis, with the maths you can redo for your own car.

7 min read · Written by Sam Richards · Last reviewed 2026-08-17

Key takeaways

Home charging on an overnight tariff is the cheapest way to fuel a car in the UK by a wide margin.
Public rapid charging is far closer to petrol per mile than most comparisons suggest — sometimes level with it.
The variable that decides everything is where you charge, not which EV you buy.

How to compare fairly

Petrol and electricity are sold in different units, so the only honest comparison is pence per mile. For a combustion car: divide the pump price per litre by your real-world miles per litre. For an EV: multiply the price per kWh by your consumption in kWh per mile.

Use real-world figures, not the official ones. Most petrol cars return 10-15% worse than their quoted mpg, and most EVs use more kWh per mile in winter than the brochure claims.

Petrol car at 45mpg with fuel at 135p/l works out around 13.5p per mile.
EV at 3.5 miles/kWh on a 7p overnight tariff is around 2p per mile.
The same EV on a 79p rapid charger is around 23p per mile.

Home charging changes the answer

The gap between a cheap overnight EV tariff and a public rapid charger is larger than the gap between the cheapest and dearest petrol in the country. If you have off-street parking and a smart tariff, an EV is dramatically cheaper to run than any petrol car.

Without off-street parking the picture narrows sharply. Relying on public rapid charging, which also carries 20% VAT rather than the 5% applied to domestic electricity, can put running costs level with an efficient petrol hatchback.

What else belongs in the sum

Fuel is only part of running cost. EVs avoid fuel duty and currently have lower servicing and brake wear, but from April 2025 they pay vehicle excise duty, and insurance and depreciation vary widely by model.

For most drivers the honest summary is: charge at home and the savings are large and consistent; charge in public and treat the EV decision as being about emissions, refinement and convenience rather than pure cost.

Frequently asked questions

Is charging an EV cheaper than petrol?

At home on an overnight tariff, dramatically so — often around 2p per mile against 13-15p for petrol. On public rapid chargers the gap narrows and can disappear.

How do I work out my own cost per mile?

For petrol, divide the pump price per litre by 4.546 to get price per gallon-equivalent, then divide by your mpg. For an EV, multiply your charging rate in pence per kWh by your consumption in kWh per mile.

Why is public charging so much dearer than home charging?

Public charge point operators pay commercial electricity rates, network connection costs and hardware maintenance, and public charging is taxed at 20% VAT compared with 5% for domestic supply.

Prices come from the UK Government's Competition and Markets Authority (CMA) open fuel price scheme and refresh throughout the day. Figures older than seven days are excluded.