EV vs petrol cost calculator
Compare the energy cost of a journey for a petrol car versus an EV using MPG, pump price, kWh use, and electricity tariff.
Results are illustrative — real-world efficiency varies with weather, speed, and charging costs.
Frequently asked questions
How much cheaper is an EV per mile than petrol in the UK?
An EV consuming 30 kWh per 100 miles (3.3 miles/kWh) charged on a 7.5p/kWh overnight home EV tariff costs 2.25p per mile (£2.25 per 100 miles), or 7.2p per mile (£7.20 per 100 miles) on a standard 24p/kWh domestic tariff. By comparison, a 45 MPG petrol car at 142p/L costs 14.3p per mile (£14.35 per 100 miles).
What happens when using public rapid EV chargers vs petrol?
At a 75p/kWh public rapid charger, an EV using 30 kWh per 100 miles costs 22.5p per mile (£22.50 per 100 miles), which is more expensive per mile than a 45 MPG petrol car at 142p/L (£14.35 per 100 miles). Mixing home charging with occasional public charging keeps average EV running costs lower.
Which electricity tariff should I use?
Home overnight off-peak rates (typically 7p to 10p/kWh) are cheapest, standard domestic rates average 24p/kWh, and public rapid charging ranges from 55p to 85p/kWh. Test each to see the range for your driving pattern.
Does this include congestion or road tax?
No. It compares energy cost only. Purchase price, insurance, servicing, VED road tax, and clean-air zone charges are separate decisions.
Can FuelRoute help if I still drive petrol or diesel?
Yes. While you run a petrol or diesel vehicle, use FuelRoute’s live station prices and detour-aware route planner to cut up to 8p–15p per litre off every fill.