By moving the slider, tell us how many miles you drive a year to find out typical annual fuel savings if you switch from petrol/diesel to an all-electric car and charge at home on the capped, government Energy Price Guarantee:

Annual Mileage

I drive 0 Miles per year

£0*

Estimated yearly fuel savings in an electric car

Petrol/Diesel*

£0

Cost estimate per year

£0 / litre

Electric*

£0

Cost estimate per year

26.35p / kWh

Electric with an off peak tariff*

£0

Cost estimate per year

7.5p / kWh

*Fuel savings and costs are estimated and should be considered as guidelines. The calculations are based on the annual mileage you choose above and the following assumptions: a litre of fuel costs £; your petrol/diesel car has an average efficiency of mpg; you charge your electric car at home at p per kWh (as correct date of: 12/11/2025); your electric car has an average efficiency of miles per kWh.

Want to know more about going electric?

Phone us now on 0118 3048 688 or email one of our expert leasing consultants at enquiries@selectcarleasing.co.uk

Browse our Electric Lease Deals!

Electricity and Fuel Cost Per Mile Analysis

Below are typical fuel costs per mile for EVs and standard petrol and diesel cars. The data is based on a distance of 10,000 miles for cost per mile calculations.

We display both the p Energy Price Guarantee rate from our calculator above (applied 24 hours a day, if you're on a standard variable tariff), together with an example off-peak home electricity rate of p.

The table shows how even greater savings are possible when charging off-peak:

	Cost per Mile	Vehicle Efficiency	Fuel Cost
Electric Car – Off-peak	p	miles per kWh	p per kWh
Electric Car – Energy Price Guarantee	p	miles per kWh	p per kWh
Diesel Car	p	mpg	£ per litre
Petrol Car	p	mpg	£ per litre

Understanding how much petrol / diesel is per mile illustrates how the electric vs petrol / diesel car comparison favours electric, especially when charging off-peak.

Why Are The Savings So Big?

Our Fuel Cost Calculator summarises how much you can save, on average, when you compare traditional fuel vs electric cars. The secret behind the savings is as follows:

The fuel cost per mile in petrol and diesel cars is high. Why? For two reasons:

Fuel prices at UK pumps are generally quite high
Internal combustion engine vehicles are not very efficient at converting fuel into forward motion.

By contrast, the fuel cost per mile in an electric car is low if you charge at home. The main reasons for this are:

Home electricity prices are currently capped at an average of p per kWh.
Even lower off-peak rates are available if you switch energy provider and/or tariff.
Electric cars – with their batteries and electric motors – are very efficient at using electricity to make the car go forwards.

What Is The Energy Price Guarantee?

The Energy Price Guarantee was brought in by the government to protect people from very high wholesale gas and electricity prices.

The energy price cap is the maximum amount energy suppliers can charge you for each unit of energy, as well as the standing charge if you're on a standard variable tariff.

At present, the energy price cap for electricity is fixed at 26.35 pence per kWh (with a 53.68 pence daily standing charge).

The Energy Price Guarantee applies to standard variable tariffs. Most of the UK population are now on standard variable tariffs. If you are on a fixed tariff, the way the guarantee applies is more complex. Read the government's Energy Bills Support Factsheet for full details of how the scheme works.

What Influences the Cost of Fuel?

Fuel prices at UK pumps can vary according to global events, such as:

The price of crude oil: The cost of the raw material that petrol and diesel comes from rises and falls in line with supply and demand, as well as geo-political events.

The strength of the Pound: Oil is paid for in US Dollars, and when the Pound weakens against the Dollar, it costs us more than it did before for the same quantity of oil.

Slow industry reactions: It's possible that petrol and diesel retailers may not react very quickly to a decrease in the cost of oil. In other words, the retailer might make a higher profit on a litre of fuel by not passing on a saving in the wholesale price to their customers immediately.

Fuel Cost Calculator FAQs

Our calculator takes your annual mileage figure and then applies it as follows (assume you drive miles a year):

For electric cars: to cover miles a year, in an EV with average efficiency of miles per kWh, you need units (kWh) of electricity. The maths is: divided by = . Charging at home off-peak at p per kWh will cost you £ a year.

For petrol/diesel cars: we assume an average engine efficiency of mpg and an average fuel price of £ per litre. To cover the same miles, you need litres of fuel which will cost you £ per year.

We use the average of the latest diesel cost per litre and petrol cost per litre nationwide (fuel data sourced from the RAC).

We update our fuel cost calculator at least every month with the latest fuel prices.

For the standard rate in the main calculator, we use the official government-backed Energy Price Guarantee rate of 26.35p per kWh. For the off-peak rate in the calculator, we use an actual rate from one of the leading dual rate tariff providers in the UK.

Some public charging points are free to use. For example, certain supermarkets allow you to charge for free while you shop.

However, to use the more advanced, faster public chargers – known as ‘rapid’ chargers – you nearly always have to pay. Rates typically vary from about p per kWh to as much as 80p per kWh or more.

If you only use rapid chargers occasionally, you will still save a lot of money by switching to electric motoring.

If you do most of your charging at rapid charging stations, then your savings will be much less and it might even be cheaper in a petrol or diesel car, depending on what kWh rate you pay.

Yes, we update all the fuel and electricity price assumptions once a month at the latest. The Fuel Cost Calculator should therefore give you a fairly accurate average savings result, though regional and supplier differences will change the result in specific situations.

Next Steps

If you are considering electric for your next car, get in touch with us now on 0118 3048 688 or email enquiries@selectcarleasing.co.uk

Alternatively, check out our handy EV Guides or browse our latest Electric & Hybrid lease deals below:

Guide

Electric Vehicle Charging Points

If you do get an EV and have off-street parking, you will want to have a dedicated charging point installed. This allows you to charge quickly and safely. Browse our range of EV chargers, all available at excellent prices with nationwide installation.

Guide

Understanding Electric Vehicle Range

Do you have range anxiety? Worried you might not reach your destination in an all-electric car before the battery runs flat? In this detailed guide, we explain the difference between WLTP and real-world range, how to extend range, etc.

Guide

Browse Guides to Electric Motoring

To support our fantastic EV lease deals, we have a wide-ranging set of guides to answer all your electric questions. We cover topics like range, charging, what are BEVs, PHEVs and HEVs, electrifying your fleet, and much more.