Every used car advert leads with two numbers, the price and the mileage, and most buyers judge the second one against a rule of thumb somebody's dad told them in 1995. The official figures say that rule's out of date, and more to the point, the number on its own is the least useful thing about a car's mileage. How it got there tells you far more.
What is the average mileage per year in the UK?
About 7,100 miles a year. That's the average for a car in England in 2025 from the Department for Transport's National Travel Survey, the same as in 2024, and it's been falling for twenty years: 9,200 in 2002, 8,000 in 2015.
It varies a lot by fuel, which matters when you're judging a particular car:
| Fuel | Average miles a year, 2025 | 2015 |
|---|---|---|
| Petrol | 6,200 | 6,500 |
| Diesel | 8,000 | 10,600 |
| Hybrid | 8,100 | Not reported |
| Battery electric | 9,400 | Not reported |
| All cars | 7,100 | 8,000 |
Source: DfT, table NTS0901, updated 10 September 2026. England only, and the mileage is each household's own estimate rather than an odometer reading, so treat it as a good average rather than a measurement of your car.
Electric cars doing the most miles of any fuel type surprises people. On an EV the mileage matters less than the battery's measured health, which used EV battery health explained covers.
Two things fall out of that table. The old "10,000 miles a year is average" line hasn't been true of the whole fleet at any point this century. And a diesel doing 12,000 a year is far less unusual than a petrol doing the same, because people who drive a lot still tend to buy diesels.
What is good mileage for a used car?
Good mileage is mileage that fits the car's age and that was gained steadily. As a working yardstick, multiply the car's age by 7,000 to 8,000 and you've got roughly what an average car would show, then adjust for fuel. A seven-year-old petrol hatchback at 45,000 is bang on normal; a seven-year-old diesel estate at 70,000 is a car that's been used for what it was bought for.
But the figure is only half of it. A car that's done 15,000 miles a year of motorway commuting has had an easier life, mile for mile, than one that's done 4,000 a year of cold starts and school runs. Motorway miles are warm, steady and kind to engines, gearboxes and suspension. Short trips are the opposite: the engine rarely reaches temperature, and on a diesel the particulate filter never gets hot enough to clear itself.
So "good mileage" is really three questions:
- Is it roughly right for the age? Use the table above.
- Was it gained evenly? The MOT history shows the mileage at every test, so you can see.
- Was the car maintained for it? High miles with invoices beats low miles with none.
What is the advert not telling you?
Paste the advert text and the registration. We read it against the car's DVSA MOT history and our known-faults database, then tell you what the seller left out.
Check an advert now (free) →What is high mileage for a car?
There's no official cut-off, so high mileage is best judged against what other cars do. In the 2025 survey, 13% of cars in England did 12,000 miles or more a year, and only 2% did 21,000 or more. A car averaging over 12,000 a year is in the busiest eighth of the fleet.
That makes it a high-mileage car, not a bad one. What changes at high mileage is the list of jobs that fall due:
| Item | Why the miles matter |
|---|---|
| Timing belt, or wet belt | Changed by miles or years, whichever comes first, and invisible from outside the engine |
| Clutch and dual-mass flywheel | Wear items on a manual, and they wear faster in town |
| Suspension bushes and links | Wear with distance, and they're among the commonest MOT advisories |
| Turbo | Lives or dies by oil changes rather than miles alone |
| Brakes and tyres | Consumables, but check they've been replaced rather than just noted |
If the belt has been done with an invoice to prove it and the service record is complete, a high-mileage car can be the best value on the page. If none of it has, price the car as though all of it's due. Wet belt replacement cost has the figures for the engines where the belt is the expensive one.
How many miles is too many for a used car?
There isn't a number, because modern cars routinely run past 150,000 miles when they're looked after, and plenty of 60,000-mile cars are worn out because they weren't. A better test is whether the mileage, the age and the paperwork tell the same story.
Walk away when they don't: very high miles with no service history, an expensive known fault for that engine that tends to show up around the current mileage, or a mileage you can't reconcile with the MOT record. The model matters here too. Our Ford Focus and Volkswagen Golf pages list the documented faults for each generation and engine, which tells you what a particular high-mileage car is likely to need next.
Is low mileage always good on a used car?
No. Low mileage is good when the car's been used gently and regularly. It's a warning when the car has barely been used at all, or when the number doesn't match its history.
In the 2025 survey 15% of cars in England did under 3,000 miles a year, so a genuinely low-mileage car isn't rare. The common honest reasons are an elderly owner, a second car, or someone who works from home. The problems with a car that's done very little are specific:
- Short trips are hard on engines. Oil that never gets hot, batteries that never fully charge, exhausts that rust from the inside.
- Diesels hate it. A diesel particulate filter needs regular hot runs to clear itself, and a low-mileage town diesel is the classic blocked-DPF car.
- Cars that sit go off. Tyres flat-spot and age out, brakes seize, seals dry, and a car stored for a year can need more than one driven for a year.
- Time-based servicing still applies. A belt has a time limit as well as a mileage one, so a ten-year-old car at 30,000 miles can still be overdue for one.
And low mileage is exactly what a clocked car looks like, which is the next question.
How do you check a car's mileage is genuine?
Read the MOT history. It's free on GOV.UK with the registration, it covers every test since 2005, and every result records the mileage on the day. Line the readings up oldest first and look at the gaps between them.
A steady climb is a normal car. The shapes worth questioning are a reading lower than the one before it, a year that's almost flat in the middle of busy ones, a long idle stretch followed by a big jump, and an advert mileage that's lower than the last MOT reading. Selling a car you know has been clocked is a criminal offence, as the Department for Transport puts it in its MOT consultation, but clocking still happens, and how to spot a clocked car goes through each shape and what it usually means.
Two limits. Cars don't need an MOT until they're three, so a nearly-new car has no independent reading at all. And the readings are a snapshot once a year, so a car clocked between tests simply shows the lower figure from then on. For those gaps you need the paperwork: service invoices with a mileage on each one.
MOT mileage wrong: is it a typo or clocking?
Usually you can tell from the shape. A typo is one reading that's out on its own, a digit missing or added, with the years either side lining up once you mentally correct it. Clocking lowers every reading that follows, because the new, lower figure becomes the starting point for the next test.
A genuine mistake can be fixed. GOV.UK's guidance on correcting MOT certificate mistakes says that within 28 days the MOT centre that did the test can update it, and after that the keeper reports it to DVSA with evidence showing the right mileage dated within a day of the test, such as the MOT invoice or a service receipt. So ask the seller why an obvious typo is still on the record, and ask for the paperwork that shows the real figure. A seller with a genuine typo has every reason to have fixed it, because it's costing them money on the sale. The clocked-car guide goes deeper on telling a typo from clocking.
Does mileage matter more than age?
Neither wins outright, because they wear different things. Mileage wears the moving parts: engine, gearbox, clutch, suspension, brakes. Age wears everything made of rubber and anything that can rust: tyres, bushes, hoses, seals, and the body. A ten-year-old car at 40,000 miles and a four-year-old car at 80,000 miles have both lived, just differently.
The rule that cuts across both is that servicing is by miles or time, whichever comes first. A low-mileage older car still needs its belt and its brake fluid on time, and the MOT history's advisories, especially corrosion, tell you more about how age has treated a car than the mileage does. MOT advisories explained shows how to read them.
Which of these questions can a check answer for you?
The honest bit first: the mileage readings are public. They're DVSA's MOT records, they're free on GOV.UK, and every check on the market reads the same ones. Nobody has a secret odometer database. Where checks differ is in what they do with the numbers.
GOV.UK hands you a table and leaves the arithmetic to you. Our free scan does the arithmetic. It plots every MOT reading as a graph and flags the shapes that don't fit: a reading that drops, a year that sits nearly flat, a sudden surge, a long stop followed by heavy use. Each flag comes with a line on what that shape usually means and what to ask.
It also does the comparison the MOT service can't, because it's never seen the advert: it reads the mileage the seller claims against the last official reading, and a claim lower than what DVSA has already recorded is flagged straight away. Then it checks the car against the known faults for that model, from 871 documented faults across 41 makes, so a high-mileage car is judged on what that particular engine tends to need at that mileage rather than on the number alone.
What it can't do is see between tests, and neither can we sell you something that does. A car clocked shortly before an MOT shows a consistent sequence from then on, and a car under three has no MOT readings to read. Our Provenance Check adds finance, theft and write-off records, plus any mileage recorded if the car went through a salvage auction, but our data supplier doesn't provide a wider mileage history, so it doesn't fill the years between tests. The service invoices in the seller's folder are the best evidence there is for those, which is why it's worth asking for them rather than the stamped book.
So what should you actually do?
Before you ring the seller, put the registration and the advert into the free scan. In a minute you'll know whether the mileage is normal for the age, whether it was gained evenly, and whether it matches what the advert says. If the car's worth chasing, the same report upgrades on the same link with nothing re-run, so starting free costs you nothing even if the answer is that the miles don't add up.
