Petrol vs Electric: The True Running Cost Comparison

Right, this is the big one. The question I get asked more than any other: "Dave, should I go electric?" And honestly? The answer isn't as straightforward as either side wants you to believe.

The electric car evangelists will tell you EVs are cheaper in every way. The petrol diehards will mutter about range anxiety and battery replacements costing more than a house extension. The truth, as always, is somewhere in the middle and it depends entirely on how you drive, where you live, and what you can afford upfront.

So let's do what I do best: strip away the marketing fluff, grab some real numbers, and work out whether going electric actually saves you money. We'll compare like-for-like cars, factor in every cost that hits your wallet, and give you an honest answer.

By the end of this, you'll know exactly where you stand.

The Cars We're Comparing

There's no point comparing a Nissan Leaf with a BMW M3. To make this fair, we need to pit petrol cars against their electric equivalents so same brand, similar size, similar trim level. That way, the only real variable is what's under the bonnet (or floor, in the EV's case).

Here are our head-to-head matchups:

These are the kinds of cars most normal people actually buy. Not Teslas, not hypercars, just sensible motors for getting the shopping done and taking the kids to football practice. Which? cars has detailed reviews on all of these if you want the full breakdown on each model.

Now, let's talk money.

Purchase Price — The Elephant in the Room

Here's the thing — electric cars still cost more to buy. There's no getting around it. That upfront premium is the single biggest factor in whether an EV saves you money overall.

Typical Purchase Prices (New)

That premium has been shrinking year on year, and it'll keep shrinking. The Golf vs ID.3 gap is already surprisingly narrow. But for the Corsa, you're still paying roughly 36% more for the electric version, which is a big ask if you're on a budget.

It's worth checking what GOV.UK EV grants are currently available - the government has historically offered incentives on EVs, chargepoint installations, and low-emission vehicles that can chip away at that premium.

Fuel vs Electricity — Where EVs Start Winning

This is where electric cars claw back that higher purchase price, and it's not even close.

The Cost Per Mile

Let's use some real-world numbers. With petrol prices bouncing around constantly you can check our live fuel map or RAC Fuel Watch for the latest but here are reasonable averages:

Petrol: Around 140-155p per litre. A typical family car manages about 45mpg in real-world driving. That works out at roughly 14-16p per mile.

Electric (home charging): The average domestic electricity rate sits around 24-28p per kWh. Most EVs manage about 3.5-4 miles per kWh in the real world. That gives you roughly 6-8p per mile.

Electric (public charging): This is where it gets murkier. Rapid chargers can cost 60-79p per kWh, which pushes your cost to 15-23p per mile and suddenly not that different from petrol.

Here's the critical takeaway: if you can charge at home, an EV costs roughly half as much per mile as petrol. If you rely entirely on public rapid chargers, the fuel saving largely disappears.

The Energy Saving Trust has some excellent comparisons on energy costs if you want to dig deeper into the numbers.

Annual Fuel Costs (10,000 Miles)

That's a saving of £700-900 per year on fuel alone. Over five years, that's £3,500-4,500. Starting to nibble at that purchase price premium, isn't it?

And here's the sneaky thing about petrol prices - they're volatile. Wars, refinery issues, government policy... your petrol costs can jump 20% overnight. Our fuel trends page shows just how much prices swing. Electricity prices move too, but far less dramatically. There's something to be said for that predictability.

Road Tax (VED) — A Clear EV Win (For Now)

Zero-emission cars registered before April 2025 pay absolutely nothing in road tax. That's been a stonking advantage — saving EV owners around £190 per year compared to petrol equivalents.

However, EVs registered from April 2025 onwards now pay the standard rate of VED, just like petrol cars. So this advantage has narrowed significantly for new buyers. That said, you still dodge the expensive first-year rate that higher-emission petrol cars attract, which can be £200+ depending on CO2 output.

Over a five-year ownership period, the tax saving for an EV is now more modest perhaps £200-600 depending on when you bought it and the petrol car's emissions. Still a win, but not the knockout punch it used to be.

Insurance — Where Petrol Fights Back

Right, let's be honest — EV insurance is still more expensive. Sometimes significantly so.

Electric cars tend to cost 15-30% more to insure than their petrol equivalents. Why? A few reasons:

• Repair costs are higher. EV-specific parts and specialist labour push up claims.
• Battery damage concerns. A minor bump that damages the battery pack can write off the whole car.
• Fewer specialist repairers. Less competition means higher labour rates.

For our matchups, the typical annual difference looks like this:

Over five years, that's an extra £500-750 for the EV. It's not a dealbreaker, but it does eat into those fuel savings.

Servicing and Maintenance - EVs Are Brilliantly Simple

This one goes firmly in the electric column. An EV motor has about 20 moving parts. A petrol engine has over 2,000. Less stuff to go wrong means less stuff to fix.

No oil changes. No spark plugs. No timing belt replacements. No clutch wear. Brake pads last longer too, because regenerative braking does most of the slowing down.

Typical annual servicing costs:

• Petrol car: £250-400 per year
• Electric car: £100-200 per year

Over five years, that's a saving of roughly £750-1,000 for the EV. Nothing to sniff at.

Depreciation - The Biggest Cost Nobody Talks About

Depreciation is the silent killer of car ownership, and it's the single biggest cost you'll face with any car. Check our running costs guide for a full breakdown of how this works.

Early EVs depreciated like a stone thrown off a cliff, mainly because battery technology was improving so fast that a three-year-old EV felt ancient. That's stabilised considerably now.

Current trends suggest:

• Petrol cars lose roughly 55-60% of their value over five years
• Electric cars lose roughly 50-60% of their value over five years

They're converging. The ID.3 and Ioniq 5 hold their value reasonably well. Teslas have been all over the place thanks to Elon's pricing games, but most mainstream EVs are now depreciating at rates comparable to petrol.

The key risk for petrol cars going forward? As EV adoption grows and potential future restrictions on combustion engines tighten, petrol resale values could take a hit. Something to think about if you're planning to keep a car for five or more years.

The Full Five-Year Comparison

Here's the full picture for our Corsa matchup over five years and 50,000 miles. This is the one most people care about - the affordable supermini that represents real-world buying decisions.

Vauxhall Corsa vs Corsa Electric — 5-Year Total Cost

The electric Corsa comes out roughly £1,600 cheaper over five years but that's assuming you charge at home most of the time. If you're relying on public chargers, the petrol Corsa actually works out cheaper.

For the Golf vs ID.3 comparison, the numbers look even better for the EV because the purchase price gap is smaller. For the Tucson vs Ioniq 5, it's broadly similar to the Corsa - marginal EV advantage with home charging.

Want to see how fuel costs work out for your specific journeys? Our trip calculator lets you plug in your actual commute and see the real numbers.

"But What About the Battery?" — Let's Talk About It

I hear this one constantly. "Yeah, but when the battery dies, you're looking at ten grand for a replacement." Let me put it this way; this fear is massively overblown.

The facts:

• Most EV batteries are warranted for 8 years or 100,000 miles
• Real-world data shows batteries typically retain 80-90% capacity after 100,000 miles
• Battery degradation has slowed dramatically with newer chemistry
• Complete battery failure is exceptionally rare - far rarer than a petrol engine dying

Think of it this way: do you worry about your petrol engine exploding? No, because it almost never happens. Same with EV batteries. Could it happen? Technically. But statistically, you're more likely to need a new gearbox on a petrol car than a new battery on an EV.

The bigger concern is range reduction over time. If your EV started with 200 miles of range, after eight years you might get 170 miles. For most people's daily driving, that's completely irrelevant. You can browse our EV and hybrid guides for more detailed information on battery health and what to look for.

Range Anxiety; Is It Still a Thing?

Honestly? It depends on your lifestyle.

Range anxiety is NOT a real issue if:

• You do under 100 miles a day (that's about 95% of UK drivers)
• You can charge at home overnight
• Your workplace has chargers
• You have a second car for the occasional long trip

Range anxiety IS still a legitimate concern if:

• You regularly drive 200+ miles in a day
• You live in a flat with no dedicated parking
• You're in a rural area with sparse charging infrastructure
• You tow caravans or heavy trailers (EVs' range drops dramatically when towing)

The Zap-Map network shows charging infrastructure across the UK, and it's growing rapidly. But "growing rapidly" and "currently adequate everywhere" are two different things. If you live in central London, you'll trip over chargers. If you live in rural Wales, it's a different story.

Dave's Verdict: Who Should Switch?

Here's my honest take after crunching all these numbers.

Go Electric If:

• You can charge at home. This is the single biggest factor. Home charging makes an EV genuinely cheaper to run. Without it, the economics get shaky.
• You mostly do short to medium journeys. Commuting, school runs, weekly shops - EVs are perfect for this.
• You're buying new or nearly new. The fuel savings need time to offset the higher purchase price. Buying a five-year-old EV and selling it two years later won't save you much.
• You want lower running costs and less hassle. No oil changes, cheaper fuel, less maintenance. It's genuinely simpler.

Stick With Petrol If:

• You can't charge at home. Relying on public chargers wipes out most of the cost advantage and adds hassle.
• Your budget is tight upfront. That £8,000 premium on a Corsa is real money. A cheaper petrol car that you can actually afford beats a more expensive EV that stretches your finances.
• You regularly do very long journeys. Motorway trips with charging stops add time. If you're a sales rep doing 300 miles a day, petrol (or a plug-in hybrid) still makes more practical sense.
• You tow regularly. EVs and towing currently don't mix well. The range drop is severe.

The Bottom Line

For a typical UK driver doing 8,000-12,000 miles a year with a driveway and a home charger, an electric car will save you money over five years. Not a fortune but it'll be cheaper, and the driving experience is genuinely lovely. Silent, smooth, and instant torque that'll pin you to your seat.

But if you're buying on a tight budget, can't charge at home, or do serious mileage, petrol still makes perfect financial sense. Don't let anyone make you feel guilty about it.

The best car is the one that fits your life, not the one that wins an argument on the internet.