Which cars are the cheapest to run? There is no single answer: a car’s purchase price, depreciation, fuel or electricity, insurance, tax and maintenance can produce very different rankings. In one three-year comparison of 10 UK best-selling models, the Volkswagen Polo came out cheapest; in a broader estimate that included finance, the Dacia Sandero was lowest and BMW i4 highest.
Those results answer different questions. The comparison that suits you depends on your mileage, driving pattern, how long you will keep the car, charging access and whether you count finance and insurance.
What does “cheap to run” actually include?
A low purchase price or strong official fuel-economy figure does not, by itself, make a car cheap to own. A useful comparison may include:
- Energy: petrol, diesel or electricity, which varies with mileage, driving and local energy prices.
- Depreciation: the difference between what you pay and what the car is worth when you sell it.
- Insurance: the premium depends on the driver, location, exact car and cover.
- Tax, servicing and repairs: costs vary by model and ownership period.
- Finance: some estimates include borrowing costs; others do not.
Check which costs a ranking counts before comparing its result with another. A per-mile figure over three years is not interchangeable with an annual estimate based on a loan and standardised insurance assumptions.
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Which cars are cheapest to run? What the rankings show
The figures below come from separate comparisons with different samples and methods. Treat each ranking as an answer within its own scope—not as a universal verdict on every version or owner.
Volkswagen Polo: lowest cost in Auto Express’s 2025 best-seller comparison
Auto Express used CAP HPI data to compare the cheapest variants of the 10 UK best-selling models of 2024 over three years and 30,000 miles. The Volkswagen Polo ranked first at 51.8p per mile; the Tesla Model Y ranked tenth at 88.7p per mile. The calculation included fuel, depreciation, servicing and maintenance, and vehicle excise duty (VED), but excluded insurance because premiums vary by individual. Read Auto Express’s comparison.
Rank #2
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- Full OBD2 Diagnostics Made Simple – More than a basic engine code reader, this OBD2 scanner diagnostic tool supports key OBDII functions including reading/clearing codes, live data, freeze frame, I/M readiness, O2 sensor test, EVAP test, vehicle information, and MIL status. It helps you check your car’s condition, verify repairs after the issue is fixed, and communicate with mechanics more confidently
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- Works With Most OBD2 Vehicles – Compatible with most 1996 and newer U.S.-based OBD2 cars, SUVs, and light trucks, as well as many 2000 and newer EU/Asian OBD2 vehicles. Supports major OBDII protocols including CAN, ISO9141, KWP2000, J1850 VPW, and J1850 PWM. This automotive diagnostic scanner is designed for wide vehicle coverage; please check compatibility with your vehicle before purchase
Dacia Sandero and BMW i4: lowest and highest in Quotezone’s 2026 estimate
Quotezone’s April 2026 estimate covered a sample of 50 popular and best-selling UK cars and included finance, fuel, insurance, tax and maintenance. It put the Dacia Sandero lowest at an estimated £7,715 a year and the BMW i4 highest at £24,191 a year. The figures are modelled estimates, not an individual owner’s bill; finance was the largest assumed cost in the i4 example. Quotezone estimated the sample’s average at £13,364 a year, broken down as £9,810 finance, £2,108 fuel, £990 insurance, £253 taxes and £203 maintenance. Its assumptions included a 48-month loan formula, standardised mileage and fuel calculations, category-based insurance and maintenance estimates, and second-year road tax. See Quotezone’s methods and estimates.
Small cars and EVs in Auto Express’s separate 2026 new-car list
A different Auto Express comparison ranked new cars over 36 months and 30,000 miles. It listed the Citroën Ami at 22.17p per mile, Dacia Spring at 37.56p, Leapmotor T03 at 40.16p, Renault 5 at 41.70p and Dacia Sandero at 41.74p. These are that list’s own total-cost assumptions and should not be combined with Quotezone’s annual estimates or treated as directly comparable to Auto Express’s separate 2025 best-seller analysis. See Auto Express’s 2026 new-car list.
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Rank #3
- Multi-Functions - Practical Multi-Functions OBD2 code reader features built-in OBD2 DTC lookup library, which help you to determine the cause of the engine light, read code, erase code, view freeze frame, I/M ready, vehicle information, data flow, real-time curve, get vehicle speed information, calculate load value, engine coolant temperature, get engine speed.
- Wide Capability - Supports 9 protocols compatible with most 1996 US-Based, 2000 EU-Based and Asian cars, and newer OBD II & CAN domestic or import vehicles. Supports 6 languages - English,German, Dutch, Spanish, French, Italian.
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- ABS / Airbag codes NOT Supported - It is able to read and clear check engine information which is part of OBDII system, but it cannot work with non-OBDII systems, including ABS / Airbag / Oil Service Light, etc.
Kia Niro: highest owner rating for running costs in Carwow’s survey
Carwow’s 2026 Driver Power survey asked more than 100,000 drivers about running costs and listed the Kia Niro first. That is an owner-survey result, not a calculated finding that the Niro is the cheapest car to own. Carwow also quoted individual comments describing the Niro as economical and Vauxhall’s Grandland and Frontera as cheap to run; those comments reflect the owners quoted, not all drivers. Read about Carwow’s Driver Power results.
What is the cheapest car to buy and run in the UK?
The evidence does not establish one all-purpose winner. The Dacia Sandero ranked lowest in Quotezone’s 50-car annual estimate, which included finance and insurance; the Volkswagen Polo ranked lowest in Auto Express’s comparison of 10 best-selling models, which excluded insurance. Auto Express’s separate new-car list also placed the Citroën Ami first by its own per-mile calculation. These are answers to different questions, not conflicting measurements of one identical cost.
Rank #4
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To choose for your circumstances, compare exact trims and use the same ownership period, mileage and cost categories. A cheap-to-buy car may lose value quickly; a fuel-efficient car may not offset a higher purchase or finance cost. Ask how long you plan to keep it and whether your calculation includes depreciation, insurance and borrowing.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How mileage, fuel type and driving pattern change the result
Mileage and ownership period
At lower annual mileage, depreciation can account for a larger share of total cost because the car loses value regardless of how far it is driven. As mileage rises, fuel or electricity and maintenance carry more weight. DriveSmart’s mileage-specific comparisons discuss this shift; the balance still depends on the vehicle and assumptions used. See DriveSmart’s mileage comparisons.
Best Value
- [Easy to Use—Work Out of the Box] + [FOXWELL 2026 New Version] FOXWELL NT604 Elite scan tool is the 2026 new version from FOXWELL, designed for car owners who want to figure out the cause of issues before fixing car problems by scanning common systems like ABS, SRS, engine, and transmission. The NT604 Elite obd2 scanner diagnostic tool comes with the latest software—no need to waste time downloading software first. Plug the scanner into the OBDII port with OBDII cable to start the diagnosis.
- [Affordable] + [Reliable Car Health Monitor] Will you be confused what happens when the warning light of ABS/SRS/transmission/check engine flashes? Instead of taking your cars to dealership, this FOXWELL scanner will help you do a thorough scanning and detection for your cars and pinpoint the root cause. Note：The device is a diagnostic tool, not a repair tool. To turn off a warning light, you must first physically repair the issue causing it. Only then can the scanner be used to clear the corresponding fault code.
- [5 in 1 Car Diagnostic Scanner] Compared with obd scanners (50-100), NT604 Elite code scanner not only includes their OBDII diagnosis but also serves as ABS/SRS scanner, transmission and check engine code reader. When it’s an odb2 scanner, you can use it to check if your car is ready for annual test through I/M readiness menu. In addition, live data stream, built-in DTC library, data play back and print, all these features are a big plus for it. Note: doesn't support maintenance functions like reset or relearn. For the SRS system, NT604 Elite can read and clear common fault codes not caused by a crash, but crash/collision data cannot be cleared.
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- [Solid protective case KO plastic carrying bag] + [Lifetime update] Almost all same price-level car scanner diagnostic tool only offers plastic bag to hold the scanner.However, NT604 Elite automotive scanner is equipped with solid protective case, preventing your obd2 scanner from damage. Then you don’t need to pay extra money to buy a solid toolbox.
Petrol, diesel, hybrid or electric
- Petrol: may have a lower purchase price, but compare total cost over your expected mileage rather than relying on the sticker price.
- Diesel: may suit long motorway journeys; whether it is economical for you depends on the specific model and use.
- Hybrid: can be a useful option for urban driving, but compare the exact model’s costs and your driving pattern.
- Electric: running costs depend on electricity prices and whether you can charge at home or work. Do not assume an EV’s energy cost without considering your charging arrangements.
Carbuyer’s 2025 guide says the Hyundai i10 1.0-litre petrol can return up to 53mpg and the Toyota Yaris up to 70mpg; it reports averaging 65mpg in its own Yaris testing. Those are guide and test claims for the named models, not guaranteed results for every driver or journey. Read Carbuyer’s guide and test context.
How to compare cars for your own budget
- Set your mileage and journey mix. Estimate annual miles and the share driven in town, on A-roads and on motorways.
- Choose a realistic ownership period. Use the same number of years for each car and account for depreciation over that period.
- Decide what “cost” means. Include or exclude finance and insurance consistently; add fuel or electricity, tax, servicing and repairs where the estimates provide them.
- Check the exact model and trim. Running costs and insurance can differ between versions of the same car.
- Get a personal insurance quote. A study average or insurance group is not your premium; request a quote for your driver details and intended car.
- For an EV, price your charging. Check whether home or workplace charging is available and use the energy prices you expect to pay.
For a practical ownership-cost checklist, cinch recommends considering insurance, economy or range, road tax, reliability and common-part costs. Those checks are useful alongside a total-cost estimate, but they do not make unrelated reliability rankings comparable. See cinch’s running-cost guide.
What “worst” means—and what these comparisons cannot prove
On the available cost figures, the BMW i4 was the highest-cost model in Quotezone’s 2026 sample, while the Tesla Model Y was highest among the 10 models in Auto Express’s 2025 best-seller comparison. Neither result establishes that the car is universally the worst to buy or drive: the studies use different samples, cost categories, time horizons and assumptions. The figures do not establish an older used car’s repair or breakdown record, either.
Quick Recap
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