Auto Cost Compared

Powertrain

Diesel: what it costs to own

The traditional high-mileage choice, still efficient on the motorway, and the powertrain with the most policy risk attached: urban access restrictions and tax treatment have moved against it across Europe.

Updated 2 min read 12 citations

The shape of the cost

The traditional high-mileage choice, still efficient on the motorway, and the powertrain with the most policy risk attached: urban access restrictions and tax treatment have moved against it across Europe. Total-cost studies that compare powertrains find the ranking of the cost lines differs between them more than the total does — which is why the shape below matters more than any single number [1].

Cost-line weights for a new diesel car A bar chart of the relative weight of depreciation, energy, insurance, maintenance, tax and financing cost for a new diesel car over its first years, on an ordinal 1–5 scale. Tax & fees4Depreciation3Energy / fuel3Maintenance3Insurance2Financing cost2
The shape for Diesel. Ranks, not amounts — where diesel is unusual is which bar is tallest and which is shortest, and that pattern is what changes the decision. Ordering consistent with the total-cost-of-ownership literature cited on this page.

Line by line

How each cost line behaves for a diesel car
LineHow it behavesWith more kilometres
DepreciationWeakened by the policy direction; used diesel values in markets with expanding low-emission zones carry a discount that has nothing to do with the car’s condition.falls
EnergyEfficient at sustained speed; the classic long-distance economy case still holds on fuel alone.rises
MaintenanceEmissions after-treatment (particulate filters, AdBlue) adds cost and adds failure modes on short urban trips the system was not designed for.rises
InsuranceIn line with petrol equivalents.holds
TaxPenalised in a growing number of registration and circulation regimes, and excluded outright from some city centres — a cost that does not appear on any invoice until you cannot drive somewhere.holds

When it wins, when it loses

Defensible only for a genuinely high-mileage motorway driver outside restricted cities, and increasingly hard to justify even there once the residual and access risks are priced.

Head to head

Diesel at each annual distance

  • 10,000 km a year — Short commutes or a second car; the car spends most of its life parked.
  • 20,000 km a year — The European and US average: a daily commute plus regular longer trips.
  • 30,000 km a year — Long commutes, sales territory, frequent motorway journeys.
  • 60,000 km a year — Professional driving, cross-country work, the car as a place of business.
Is a diesel car cheap to run?
Efficient at sustained speed; the classic long-distance economy case still holds on fuel alone. Emissions after-treatment (particulate filters, AdBlue) adds cost and adds failure modes on short urban trips the system was not designed for.
Does a diesel car hold its value?
Weakened by the policy direction; used diesel values in markets with expanding low-emission zones carry a discount that has nothing to do with the car’s condition.
Who should buy a diesel car?
Defensible only for a genuinely high-mileage motorway driver outside restricted cities, and increasingly hard to justify even there once the residual and access risks are priced.

References

Every citation below links to the original peer-reviewed record on PubMed or via DOI. Nothing here is a substitute for medical advice.

  1. How to Improve the Total Cost of Ownership of Electric Vehicles: An Analysis of the Light Commercial Vehicle Segment Lebeau P, Macharis C, Van Mierlo J · World Electric Vehicle Journal · 2019 · Journal article DOI
  2. Total cost of ownership of electric and gasoline used vehicles Woody M, Yin S, Green A, et al. · Environmental Research Letters · 2026 · Journal article DOI
  3. Fair Market Value of Used Capacity Assets: Forecasts for Repurposed Electric Vehicle Batteries Bach A, Onori S, Reichelstein S, et al. · The Accounting Review · 2026 · Journal article DOI
  4. Ownership Levies and Electric Vehicle Adoption: A Total Cost of Ownership and Legal Analysis of Ukraine’s Fiscal Reversal Vovk Y, Vovk I, Martsenko N, et al. · World Electric Vehicle Journal · 2026 · Journal article DOI
  5. Route-Specific Total Cost of Ownership for Electric Trucks: A Danish Distribution Case Study Iversen L, Rehmeier C · World Electric Vehicle Journal · 2026 · Journal article DOI
  6. Depreciation Patterns in the UAE Used Car Market: Evidence from Dubizzle Listings Miranda A, Alavi A, Gella M · Journal of Business Insight and Innovation · 2026 · Journal article DOI
  7. Optimizing Charging Control for Fast and Efficient Electric Vehicle Charging Han L, Liu H, Zhang Y, et al. · Journal of Autonomous Vehicles and Systems · 2025 · Journal article DOI
  8. Modeling the Used Vehicle Market Share in the Electric Vehicle Transition Diouf B · World Electric Vehicle Journal · 2025 · Journal article DOI
  9. Research on Battery Electric Vehicles’ DC Fast Charging Noise Emissions: Proposals to Reduce Environmental Noise Caused by Fast Charging Stations Clar-Garcia D, Campello-Vicente H, Fabra-Rodriguez M, et al. · World Electric Vehicle Journal · 2025 · Journal article DOI
  10. An Optimal Multi-Zone Fast-Charging System Architecture for MW-Scale EV Charging Sites Althurthi S, Rajashekara K · World Electric Vehicle Journal · 2025 · Journal article DOI
  11. Total Cost of Ownership of Electric Buses in Europe Ghotge R, van Rooij D, van Breukelen S · World Electric Vehicle Journal · 2025 · Journal article DOI
  12. Analysis Report on the Used Car Market Pricing Yang H · Finance & Economics · 2025 · Journal article DOI