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

Electric saloon car parked at the roadside in Munich
AuHaidhausen · CC BY 4.0 · Wikimedia Commons

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

German filling station forecourt with pumps under a wide flat canopy
Dietmar Rabich · CC BY-SA 4.0 · Wikimedia Commons

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. What Holds Its Value Price Determinants in Indias Used Motorcycle Market and the Absence of the Yamaha RX100 Bhavnagri P · International Journal for Research in Applied Science and Engineering Technology · 2026 · Journal article DOI
  4. 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
  5. 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
  6. 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
  7. Dynamic User Equilibrium for Electric Vehicle Departure Time and Path–Charging Choices with Wireless and Fast Charging Services Zhang X, Ren H · World Electric Vehicle Journal · 2026 · Journal article DOI
  8. Machine Learning for Plug-in-Time Classification of Charging Faults and Abnormal Termination Events in Public Electric-Vehicle Charging Sessions Thango B, Duan C · World Electric Vehicle Journal · 2026 · Journal article DOI
  9. Total Cot of Ownership of Electric Car and Internal Combustion Engine Car With Performance Normalization Santoso A, Priyono B · International Journal of Environmental, Sustainability and Social Science · 2026 · Journal article DOI
  10. 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
  11. The impact of intra-European used-car trade on electric vehicle market diffusion and greenhouse gas emissions Frank F, Disch F, Gnann T · eceee Summer Study proceedings · 2026 · Journal article DOI
  12. Residual Value Patterns and Price Dispersion in Cambodia’s Used-Car Finance Market Pak J · American Journal of Student Research · 2026 · Journal article DOI