Electric cars can cost less to own and drive than petrol cars, but only if you drive enough miles and keep the car long enough for fuel and maintenance savings to outweigh the higher purchase price.

The sticker price of an electric car is almost always higher than a comparable petrol car. A new EV might cost £5,000 to £15,000 more upfront. But the money you save on fuel, servicing, and repairs over the life of the car can eventually make the total cost lower. The question is not whether EVs are cheaper in theory—it is whether they are cheaper for your actual driving pattern and how long you plan to keep the car.

The break-even point—where cumulative fuel and maintenance savings equal the price difference—typically happens between 50,000 and 100,000 miles, depending on electricity prices in your area, how much you drive, and which models you are comparing. If you drive 10,000 miles a year and plan to keep the car for ten years, you will likely reach that point. If you drive 5,000 miles a year or trade the car in after three years, you probably will not.

Key Takeaways

  • Electricity costs roughly one-third to one-half as much as petrol per mile, so the longer you drive, the faster you recover the higher purchase price.
  • Electric cars have no oil changes, spark plugs, or transmission fluid, and brake pads last much longer because regenerative braking does most of the stopping work.
  • The break-even point usually falls between 50,000 and 100,000 miles, but varies based on local electricity rates, petrol prices, and which cars you compare.
  • Buying used or waiting for price drops can lower the upfront cost and shorten the time to break-even.
  • Depreciation is still uncertain for EVs because the market is newer, so total ownership cost depends partly on what the car is worth when you sell it.

How fuel costs differ between electric and petrol cars

Charging an electric car costs roughly £0.03 to £0.05 per mile, depending on your local electricity rate. Driving a petrol car costs roughly £0.10 to £0.15 per mile, depending on fuel economy and petrol prices. That means an EV costs about one-third to one-half as much to fuel per mile. Over 10,000 miles a year, the difference is £700 to £1,200 in fuel costs alone.

This gap widens if you charge at home during off-peak hours, when electricity is cheaper. It narrows if you rely on rapid public chargers, which cost more per kilowatt-hour. It also depends on your car's efficiency—some EVs use 4 miles per kilowatt-hour, others use 3, and a few use 5. A petrol car's fuel economy matters the same way: a 50 mpg hybrid saves more on fuel than a 30 mpg SUV.

Petrol prices and electricity rates both fluctuate. When petrol is expensive, the EV advantage grows. When electricity rates rise or petrol prices fall, the gap shrinks. Over the life of a car, these changes average out, but they affect the real break-even point in your area right now.

Maintenance and repair costs favour electric cars significantly

An electric car has no engine oil, oil filter, spark plugs, timing belt, transmission fluid, or fuel injectors. Those are the parts that wear out and need replacing in a petrol car. An EV's main moving parts are the electric motor, which has no wear items, and the battery, which is warrantied for eight years or 100,000 miles in most cases and rarely fails before that.

Brake pads last two to three times longer on an EV because regenerative braking—using the motor to slow the car—does most of the stopping work. Friction brakes are used only for emergency stops or when the battery is fully charged. A petrol car's brakes work every time you slow down, so they wear faster.

Over 100,000 miles, a petrol car typically costs £3,000 to £5,000 in scheduled maintenance and repairs. An EV typically costs £500 to £1,500. That £2,000 to £3,500 difference is real money that goes toward offsetting the higher purchase price. It is also money you do not have to spend on unexpected breakdowns, because EVs have fewer things that can fail.

The break-even calculation depends on your driving and ownership timeline

To find your break-even point, start with the price difference between the EV and the petrol car you would buy instead. Subtract the fuel savings per year and the maintenance savings per year. Divide the remaining difference by your annual miles driven, then multiply by the miles you expect to drive before selling or scrapping the car.

Example: A new EV costs £35,000 and a comparable petrol car costs £25,000. The difference is £10,000. You drive 12,000 miles a year. Electricity costs £0.04 per mile and petrol costs £0.12 per mile—a saving of £0.08 per mile on fuel, or £960 per year. Maintenance saves £400 per year. Total annual savings: £1,360. At that rate, you break even after 7.4 years, or roughly 88,000 miles. If you plan to keep the car for ten years, you come out ahead. If you trade it in after four years, you do not.

The calculation changes if you drive less. At 6,000 miles a year, the same cars break even after 14.7 years—longer than most people keep a car. At 20,000 miles a year, break-even happens after 4.4 years. Your actual break-even point depends on your miles, your local electricity and petrol prices, and which specific models you compare.

Used electric cars and price drops can shorten the payback period

New EV prices have fallen significantly in the past two years as production has scaled up and battery costs have declined. Buying a used EV from two to four years ago can cost £5,000 to £10,000 less than a new one, which cuts the break-even point in half. A used EV with 40,000 to 60,000 miles on it still has most of its battery warranty remaining and has already absorbed the steepest depreciation.

Waiting for prices to fall further is a gamble. EV prices may continue to decline as competition increases, or they may stabilize. Petrol car prices may rise if they become less common. The fuel and maintenance savings you gain by driving an EV now might outweigh the savings from waiting for a cheaper purchase price later.

Some regions offer grants or tax reductions for EV purchases, which lower the upfront cost and improve the break-even calculation. These vary by country and change frequently. Checking your local government's transport or environment department website will show what is available where you live.

Depreciation and resale value add uncertainty to the total cost

A petrol car loses value in a predictable way: roughly 50 to 60 percent of its purchase price over five years. An EV's depreciation is less certain because the market is newer and battery technology is improving quickly. Some used EVs hold value well because demand is strong. Others depreciate faster because buyers worry about battery degradation or worry that a newer model with better range will make theirs obsolete.

If you plan to keep the car for ten years and drive it until it is worth very little, depreciation does not matter much. If you plan to sell it after five years, depreciation directly affects whether you come out ahead. A car that costs £35,000 new and is worth £15,000 after five years has cost you £20,000 to own, plus fuel and maintenance. If an EV costs £35,000 new and is worth £18,000 after five years, the ownership cost is £17,000 plus fuel and maintenance—a saving of £3,000 before fuel and maintenance savings are counted.

Resale value also depends on battery health. Most EV batteries retain 85 to 95 percent of their capacity after 100,000 miles. A battery report from a specialist can show a buyer the actual state of the battery, which affects the price. This is becoming more common as the used EV market matures, but it is still less standardized than a petrol car's condition report.

Charging at home versus public chargers changes the fuel cost equation

Home charging is the cheapest way to fuel an EV. A Level 2 home charger (7 kW) costs roughly £500 to £1,500 to install and charges the car overnight for £0.03 to £0.04 per mile. Public rapid chargers (50 kW or faster) cost £0.08 to £0.15 per mile because the electricity is more expensive and you pay a premium for speed. If you rely on rapid chargers for most of your charging, the fuel cost advantage shrinks.

Most EV owners charge at home overnight and use public chargers only for long trips. If you do not have off-street parking or a garage, home charging is not possible, and your fuel costs will be higher. This is one of the biggest factors that determines whether an EV makes financial sense for you. If you can charge at home, the savings are substantial. If you cannot, the advantage is smaller.

Frequently Asked Questions

How much does it cost to install a home charger?

A Level 2 home charger typically costs £500 to £1,500 installed, depending on your electrical panel capacity and how far the charger is from the panel. Some regions offer grants that cover part or all of the cost. A may have access to electrician must do the installation to may support it is safe and meets building codes.

What happens to an electric car's battery after ten years?

Most EV batteries retain 85 to 95 percent of their capacity after ten years or 100,000 miles. Degradation slows over time, so the battery loses more capacity in the first five years than the second five. Batteries are warrantied for eight years or 100,000 miles, whichever comes first, and replacement costs £5,000 to £15,000 depending on the car. Very few batteries fail within the warranty period.

Is an electric car cheaper if I drive very few miles per year?

No. If you drive fewer than 5,000 miles per year, the fuel and maintenance savings will not offset the higher purchase price within a reasonable ownership period. An EV makes the most financial sense for people who drive 10,000 miles or more per year and plan to keep the car for at least five to seven years.

Do I need to buy a new EV to get the cost benefit, or will a used one work?

A used EV can offer better value because the purchase price is lower and the break-even point comes sooner. A used EV from two to four years ago typically costs £5,000 to £10,000 less than a new one and still has most of its battery warranty. Check the battery health report before buying to confirm the battery is in good condition.

What if petrol prices drop or electricity rates rise?

Both are possible. If petrol becomes much cheaper, the fuel savings shrink and break-even takes longer. If electricity rates rise significantly, the same thing happens. Over the life of a car, these prices fluctuate, but historical trends show electricity has been more stable than petrol. Your break-even calculation should use current local prices, not predictions about future prices.