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The numbers don't lie

Cut your fuel bill
by up to 70%.

Charging at home on a smart tariff costs around 70% less per mile than petrol. Move the slider to see what that means in pounds for your annual mileage.

UK average is around 7,400 miles/yr 10,000 miles

* Based on the current South East average petrol price of 169p/litre, an average EV efficiency of 3.5 miles/kWh, and the Octopus Go overnight smart tariff rate of 7p/kWh. Standard home electricity rates are around 24p/kWh — your saving may vary depending on your tariff.

Fuel cost reduction
~70%
cheaper per mile than petrol
You could save every year
£0
charging on Octopus Go
Annual petrol cost
£0
at 169p/litre
Annual EV cost
£0
on Octopus Go (7p/kWh)
Charger payback period
0 months
based on Standard charger
5-year total saving
£0
vs staying on petrol
Side by side

Petrol vs EV — the full picture.

Beyond fuel costs, here's how the two compare across the things that matter.

Factor Petrol Electric (home charged)
Fuel cost per mile~16–22p~4–7p ✓
Annual servicing~£250–£500~£100–£150 ✓
Road tax (VED)£190–£600+/yr£0 (pre-2025 EVs) ✓
Fuel stop time5–10 min at pumpCharges overnight ✓
Morning routinePetrol station tripsFull charge every morning ✓
CO₂ emissions~120–180g/km0g/km tailpipe ✓
Congestion charge (London)£15/dayExempt ✓
Engine complexity2,000+ moving parts~20 moving parts ✓
Range anxietyNoneManageable with home charger ✓
Upfront costGenerally lowerHigher — offset by running savings
Common questions

People also ask.

Most drivers save between £800 and £2,000 per year depending on their mileage and electricity rate. At 10,000 miles per year, charging at home at the standard rate (around 24p/kWh), you'd typically save around £1,200 compared to petrol at 170p/litre. Switch to a smart tariff and that saving rises significantly — some tariffs charge as little as 7p/kWh overnight, bringing annual charging costs under £300 for a typical driver.
For most people who can charge at home — yes, decisively. The fuel saving alone typically pays back a home charger within 6–12 months. Add lower servicing costs (EVs have far fewer moving parts), no road tax on older EVs, and congestion charge exemption in London, and the financial case is strong. The main caveats are higher upfront purchase price for the car, and range anxiety if you regularly drive 200+ miles in a day without access to rapid chargers.
At the standard rate (around 24p/kWh), a typical driver doing 10,000 miles/year will add roughly £700–£800 to their annual electricity bill. However, on a smart EV tariff like Octopus Go (7p/kWh overnight), that drops to around £200–£250 per year. Most EV drivers switch tariffs when they get the car — it's the single biggest way to reduce running costs. Your home charger can be set to charge automatically during the cheap window.
Yes — most EVs come with a 3-pin plug cable (called a granny cable) that works in a standard 13A socket. However, it's very slow: typically 6–8 miles of range per hour of charging. For a full charge from empty, that's 30–40 hours. A home charger delivers 7.4kW — about 30 miles of range per hour — and is far safer for regular overnight use. Standard sockets aren't designed for sustained high loads over many hours, which is why a dedicated home charger is strongly recommended.
With a 7.4kW home charger — which is what we install — most EVs charge from 20% to full in 4–7 hours. In practice, most people plug in overnight and wake up to a full battery. You never really wait for a charge the way you'd queue at a petrol station — you just charge while you sleep.
Honest answer: there are some. Higher purchase price for the car is the biggest one. Range anxiety is real for some drivers, though less so if you have a home charger — you start every day with a full battery. Public charging infrastructure is improving but still patchy in places. Battery degradation over time means range reduces slightly in older EVs. And if you live in a flat with no off-street parking, home charging isn't currently an option. That said, for most homeowners with a driveway doing typical UK mileage, the pros significantly outweigh the cons.

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