Introduction
There's no single number that makes a used car's mileage automatically "good" or "bad." It depends on the car's age, how it's been maintained, and even the type of driving it's done. A high-mileage car with a properly documented service history can be a better buy than a low-mileage one that's been neglected.
This guide walks through what actually counts as average, low or high mileage for a used car's age, how it affects price, and what to actually check before deciding a specific mileage is a dealbreaker.
Summary:
- The UK average is around 7,100 miles a year, according to the latest Department for Transport figures, though anything from 7,000 to 10,000 is considered average for an older used car.
- Mileage is only part of the story. Service history, driving type, and how well a car's been looked after can matter just as much as the number on the clock.
- Certain components typically need replacing around the 60,000-mile mark, brake discs, the clutch, and the timing belt, worth checking if a car's approaching this milestone.
- A low-mileage diesel isn't automatically the safer choice. Short trips can clog the diesel particulate filter, an expensive fix if it fails.
- No mileage is technically "too high" if the car's been properly maintained, some well-looked-after cars comfortably exceed 200,000 miles.
Why Does Mileage Matter?
The higher a car's mileage, the more wear its mechanical parts, bodywork and electrical components have been subjected to, which is why it directly affects both condition and resale value.
It's also worth knowing mileage can affect warranty coverage specifically, many manufacturer and extended warranties carry a mileage limit alongside the age limit, so a car that's covered unusually high miles for its age may already have run past its cover entirely, regardless of how many years remain.
What Counts as Average Mileage?
According to the latest Department for Transport figures, the UK average sits at around 7,100 miles a year, though this has been gradually decreasing over recent years. For an older used car specifically, anything between 7,000 and 10,000 miles a year is generally considered a reasonable average.
Working Out Low, Average or High Mileage
Divide a car's total mileage by its age in years to get its average annual mileage, then compare that to the figures above.
| Car Age | Mileage | Average Annual Mileage | Status |
|---|---|---|---|
| 3 years | 9,000 | 3,000 | Low mileage |
| 3 years | 24,000 | 8,000 | Average mileage |
| 3 years | 60,000 | 20,000 | High mileage |
It's often quicker to work the other way round too, multiplying the UK average by a car's age to get a rough benchmark for what counts as reasonable mileage for that age.
| Car Age | Roughly Reasonable Mileage |
|---|---|
| 3 years | 21,000-30,000 miles |
| 5 years | 35,000-50,000 miles |
| 8 years | 56,000-80,000 miles |
| 10+ years | 70,000-100,000 miles, or more if well maintained |
How Does Mileage Affect Price?
Take two otherwise identical cars, same make, model, age and condition, and the one with lower mileage will command a higher price. The gap can be substantial too, on some popular family SUVs, a low-mileage example can be worth several thousand pounds more than a higher-mileage equivalent of the same age.
What's the Best Mileage to Buy?
This genuinely comes down to priorities rather than a single right answer. A higher-mileage car costs less upfront but carries more wear, potentially meaning higher maintenance costs down the line.
Certain components have a working lifespan tied more closely to mileage than age, brake discs, the clutch and the timing belt typically need replacing somewhere around the 60,000-mile mark, and the cost can run into hundreds or even low thousands of pounds if they haven't been done recently.
A car with fewer than 30,000 miles will generally cost less to maintain than one approaching 100,000, but how well previous owners actually looked after it matters just as much as the number itself.
Does the Type of Mileage Matter?
Genuinely, yes. City driving, with constant stopping, starting and speed bumps, puts more strain on a car than steady motorway miles do. Country roads can be tough too, hills, corners, potholes and road salt all take a toll.
Motorway driving is comparatively gentle, letting the engine run at a steady, healthy temperature on smooth, flat roads, so "mainly motorway miles" in a listing is a positive sign, even if it's difficult to verify directly.
Factors That Matter as Much as the Mileage Itself
| Factor | Better Sign | Worse Sign |
|---|---|---|
| Driving type | Mainly motorway, steady speeds | Mainly city, stop-start traffic |
| Ownership | One owner with full service records | Multiple owners, gaps in the history |
| Winter storage | Garaged, regularly washed underneath | Left outside through winter, rarely cleaned |
Winter road salt is genuinely worth taking seriously in the UK specifically, since our damp climate makes salt-accelerated corrosion a real risk regardless of region. It's a common cause of MOT failures on the exhaust, brake lines and suspension, so a car that's been regularly washed underneath through winter has a genuine advantage over one that hasn't, quite separate from its mileage.
Is Low Mileage Always Better?
Not necessarily. A car that's covered very few miles for its age has often spent long periods sitting unused, which brings its own set of issues, flat spots developing on the tyres, seals and gaskets drying out, injectors gunging up, and even the timing chain stretching from lack of regular use.
None of these are usually expensive to put right individually, but a fastidiously maintained higher-mileage car can be a safer bet than a low-mileage one that's simply been left sitting.
There's a more specific concern for diesel buyers too. If a low-mileage diesel has mostly done short trips, its diesel particulate filter may never have reached the temperature it needs to clear itself properly, a genuine risk that can lead to an expensive repair.
For the full picture on keeping a DPF healthy, see our guide on car maintenance tips.
Is There a Mileage That's Too High?
There's a genuine psychological barrier around 100,000 miles that's largely outdated. Advice to avoid any car once it hits six figures used to be common, but it isn't necessary, a well-maintained car can comfortably travel well beyond that, and 200,000 miles or more is entirely achievable with proper care.
Around 150,000 miles is where a car's considered to have covered a lot, since major components like the suspension, clutch or gearbox may already have needed attention or be due for it soon. Even so, plenty of well-maintained cars comfortably exceed this too, it comes down to how the individual car's been looked after rather than the number alone.
Not really then, provided the car's been properly maintained. That said, keeping a very high-mileage car on the road doesn't always make financial sense once repair costs start regularly exceeding what the car's actually worth, worth factoring in before committing to one specifically for the low asking price.
Does "Good Mileage" Differ by Fuel Type or Transmission?
Genuinely, yes, and it's worth knowing before applying one blanket rule to every car.
Diesel engines are known for their longevity, comfortably exceeding 150,000 to 200,000 miles when properly maintained, so high mileage is generally less of a worry here than with petrol, provided the particulate filter's been looked after.
Petrol cars are typically cheaper to buy and run, but mileage over 100,000 tends to become more of a factor in wear and depreciation than it does for an equivalent diesel.
Automatic gearboxes are more sensitive to high mileage specifically, since they're expensive to repair or replace. A high-mileage automatic with proof of proper gearbox servicing can still be a sound buy, but it's worth extra caution if that evidence isn't there.
Manual cars are usually simpler and cheaper to maintain overall, with clutch wear the main mileage-related concern at higher figures.
Electric cars flip the whole question, since mileage itself matters considerably less without a combustion engine or traditional gearbox to wear out. Battery health becomes the real deciding factor instead, worth checking charging habits, remaining range, and any manufacturer warranty still in place.
What Are the Best High-Mileage Cars to Buy?
The best high-mileage car is genuinely one that's been properly maintained, since beyond a certain point, how well a car's been looked after matters more than its badge.
That said, some brands are statistically more likely to hold up well over higher mileages than others. Our own guide on the most reliable used cars is a good starting point, several Toyota models feature prominently, alongside Honda, Hyundai and other consistently well-regarded brands.
What Mileage Does a Warranty Actually Cover?
Most new cars come with a manufacturer warranty covering three years or 60,000 miles, whichever comes first, though this varies considerably by brand. Kia offers 7 years or 100,000 miles, Hyundai covers 5 years with no mileage limit at all, and Toyota extends to 10 years or 100,000 miles provided the car's serviced annually at a Toyota dealership specifically.
If you're buying a nearly-new used car, checking how much of this cover actually remains is worth doing before you commit. Many manufacturers and independent providers also offer extended warranties once the original cover expires, worth considering for genuine extra peace of mind on an older or higher-mileage car specifically.
Mileage and Car Finance
If you're financing through a Personal Contract Purchase (PCP) agreement, you'll typically agree an annual mileage limit upfront, and exceeding it means a genuine penalty at the end of the agreement if you hand the car back or move onto a new PCP deal. Pay the final balloon payment instead, and mileage stops mattering entirely, since the car's now genuinely yours.
Hire Purchase (HP) agreements don't carry a mileage limit at all, since you're contracted to buy the car outright regardless, though ending the agreement early with unusually high mileage can still complicate things. For the full picture on how each option actually works, see our guide on used car finance explained.
Conclusion
Mileage matters, but it's genuinely never the whole picture. A well-documented service history, honest evidence of how the car's actually been driven, and a proper check of the components due around the 60,000-mile mark will tell you considerably more than the number on the odometer alone.
For the full picture on verifying all of this properly before you buy, see our guide on how to check a used car's history.
Frequently Asked Questions
Does age or mileage matter more when buying a used car?
Neither matters as much as how well the car's actually been maintained. A high-mileage car with a full, honest service history can be a better buy than a lower-mileage one that's been neglected.
Is 100,000 miles too many for a used car?
Not automatically. Provided the major mileage-related components have been properly maintained or replaced, a car well past 100,000 miles can still be a sound purchase.
What's the best mileage to look for if I want low maintenance costs?
Under 30,000 miles generally means less wear and lower ongoing costs, though a well-maintained higher-mileage car can still work out cheaper overall than a neglected low-mileage one.
Should I worry about a low-mileage diesel specifically?
It's worth checking. A diesel that's mostly done short trips may have a diesel particulate filter that's never properly cleared itself, a genuine risk worth asking about before buying.
What mileage should I expect a manufacturer warranty to cover?
It varies by brand, typically three years or 60,000 miles as standard, though some manufacturers, Toyota and Kia among them, offer considerably longer cover with proper servicing.
What's the best mileage to sell a car at?
There's no fixed rule, but certain milestones affect value, under 30,000 miles is considered low, while components like the clutch or timing belt often need replacing between 50,000 and 70,000 miles, and 100,000 miles is a significant marker too. Selling before your car reaches around 60,000 miles can genuinely help you avoid the steepest part of the depreciation curve specifically.
