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Ask a small fleet what a van costs and you will usually get the purchase price. Ask what it costs to run for three years and the answer gets vaguer, which is a problem, because that second number is the one that decides whether the fleet makes money. Total cost of ownership is not a complicated idea. It is just the discipline of counting everything, over the whole time you keep the vehicle, and dividing by the distance it covers.
Why purchase price is the smallest number
Over a typical three to five year fleet cycle, the money spent buying a vehicle is routinely a minority of what it costs to own. Fuel or electricity, servicing, tyres, insurance, finance and the value lost to depreciation all accumulate quietly while the purchase price sits in the accounts as a single memorable figure.
That is why a cheaper vehicle can be the more expensive decision. A van that costs less up front but drinks more fuel, needs servicing more often or holds its value poorly will hand the difference back, with interest, over the years you keep it.
The lines that actually move the number
Not every cost line matters equally. These are the ones that decide the outcome:
- Fuel or energy. Usually the largest running cost, and the one most sensitive to how the vehicle is used. Multiply your real annual distance by real consumption, not the brochure figure.
- Depreciation. Often the single biggest line overall, and the easiest to ignore because you never write a cheque for it. It only becomes visible on the day you sell.
- Servicing and repairs. Scheduled maintenance is predictable; the unscheduled kind is not, and it rises sharply as vehicles age.
- Tyres. Modest per vehicle, significant across a fleet, and heavily affected by load, alignment and driving style.
- Insurance. Driven as much by your claims history and driver profile as by the vehicle itself.
- Finance. The cost of the money, which is a real cost whether you lease, borrow or pay cash.
- Downtime. The hardest to quantify and frequently the most expensive. A vehicle off the road is a job not done, and sometimes a hire vehicle as well.
Cost per kilometre is the comparison unit
Once you have the total, divide it by the distance the vehicle will realistically cover over the period. Cost per kilometre – or per mile, if that is how you work – is the only figure that compares fairly across vehicles of different sizes, fuels and purchase prices.
It also makes the awkward cases obvious. A vehicle with a low total cost that barely moves can have a terrible cost per kilometre, which usually means you are running one vehicle too many rather than the wrong vehicle.
Where small fleets get it wrong
Three mistakes recur. The first is using manufacturer consumption figures instead of what the vehicles actually return in your operation, which flatters the efficient-looking option. The second is leaving depreciation out entirely, which makes every purchase look cheaper than it is and makes a used vehicle look better than it usually is once you count repairs.
The third is comparing a specification rather than a job. Two vans with similar numbers can be very different once you add the racking, the payload you actually carry and the hours the engine idles on site.
Running the numbers before you commit
You do not need a fleet management platform to do this. A spreadsheet with one column per candidate vehicle and one row per cost line will settle most decisions, provided the inputs come from your own records rather than from a brochure.
The US Department of Energy publishes a free Vehicle Cost Calculator that models total cost of ownership across fuel types, which is a useful sanity check on your own figures – particularly when you are comparing a diesel vehicle against an electric one, where the balance between purchase price and running cost shifts substantially. It is built around individual vehicles rather than fleets, so treat it as a per-vehicle cross-check rather than a fleet model.
Reviewing it after the fact
A total cost of ownership figure calculated once, at purchase, is a forecast. Its value comes from checking it against what actually happened – and the second cycle of purchasing is far better informed than the first, because you finally have your own numbers instead of assumptions.
Keep fuel, servicing and downtime records per vehicle rather than per fleet. It is a small amount of admin, and it is the difference between knowing which vehicles earn their keep and guessing.
Related guides
- Fleet Management for Beginners: The First-Year Playbook
- How to Reduce Fleet Fuel Costs
- Fleet Electrification: Planning the Switch to EVs
- Fleet Safety Programs and Driver Onboarding
- When to Replace a Fleet Vehicle (and When to Keep It)
