A businessman in Tanzania showed me his books once. He was running eight HOWO tractor units and he was convinced he was making money. His freight revenue was strong, his customers paid on time, and his drivers showed up for work. On paper, the business looked healthy.
I went through his numbers with him. Fuel was costing him 48% of his revenue. Tyres were eating another 8%. Maintenance and parts — a mix of genuine and “whatever was available” — were sucking up 14%. Driver wages, permits, insurance, and office overhead consumed 18%. And his truck financing payments took 15%.
That adds up to 103% of his revenue. He had been losing money for eighteen months and didn’t know it because he was tracking revenue and major expenses but not the total cost picture.
This is the conversation that most fleet operators need to have and almost none of them do. Understanding your true cost per kilometer isn’t complicated math. It’s uncomfortable math. And it’s the difference between running a business and running a charity for the benefit of your customers and fuel suppliers.
Every rand, naira, cedi, shilling, or dollar that goes out of your fleet operation falls into one of five buckets:
Fuel is almost always the largest single cost. For a HOWO tractor unit averaging 3 kilometers per liter with diesel at $1.00 per liter, your fuel cost per kilometer is about 33 cents. At 120,000 kilometers per year, that’s nearly $40,000 in fuel — per truck.
What drives fuel consumption beyond the obvious: tyre inflation pressure (underinflated tyres increase rolling resistance by 10-15%), aerodynamics (a poorly adjusted wind deflector costs 3-5% in fuel at highway speeds), driver behavior (aggressive acceleration and late braking can increase consumption by 15-20% compared to smooth driving), and engine condition (a clogged air filter, a failing injector, or a turbocharger that’s not producing full boost all increase consumption).
This is the bucket that you can influence most dramatically through parts sourcing and preventive maintenance practices. A fleet that buys quality parts from a reliable supplier and maintains its trucks on schedule will spend at the lower end of this range. A fleet that buys the cheapest parts available and fixes things only when they break will spend at the upper end — and will have higher downtime costs on top of the parts and labor costs.
What drives maintenance costs:
Covered in detail in my tyre article, but the key point for TCO calculations: track cost per kilometer for tyres, not cost per tyre. A $500 tyre that lasts 80,000 kilometers costs 0.625 cents per kilometer. A $380 tyre that lasts 50,000 kilometers costs 0.76 cents per kilometer. The cheaper tyre is more expensive.
Driver wages, benefits, training, and the administrative staff who support the fleet. This bucket includes the cost of driver turnover — replacing a driver costs roughly three months of their wages when you account for recruiting, training, and the productivity loss during the transition.
What drives these costs:
Truck financing or lease payments, insurance, permits, licenses, yard rent, office costs, and administrative overhead. These costs don’t change with the number of kilometers driven, but they’re real and they’re accumulating every day whether the truck is moving or parked.
Cost per kilometer (CPK): Total of all costs in all five buckets, divided by kilometers driven. This tells you whether each kilometer is profitable or not.
Cost per day (CPD): Total fixed costs divided by 365. This tells you what the truck costs you even when it’s not moving.
The CPK determines your profitability on the freight you haul. The CPD determines your breakeven utilization — the minimum number of days per month the truck has to be working to cover its fixed costs.
Example calculation for a HOWO tractor unit in West Africa:
Annual fixed costs (financing, insurance, permits, yard, office share): $18,000 per year = $49.32 per day. If your gross profit per working day (after fuel, tyres, maintenance, driver costs) is $180, you need to operate the truck at least 100 days per year to cover fixed costs — anything above that is profit. At 280 working days per year, your annual profit per truck is roughly $32,400.
Now compare that to the same truck operating 200 days per year because it spends 80 days in the shop waiting for parts or repairs. Your profit drops to $18,000 — a 44% reduction. The parts that would have prevented those 80 days of downtime don’t look expensive anymore.
Deferring maintenance is the most expensive cost-saving strategy in fleet management. It works on this month’s P&L statement and destroys next year’s.
An oil change that costs $300 deferred by another 5,000 kilometers saves $300 today. The accelerated engine wear from dirty oil — which you won’t see on the income statement until the engine needs an overhaul 150,000 kilometers earlier than it should have — costs roughly $6,000 in shortened engine life.
A set of brake linings that costs $400 should be replaced now but can “probably go another month.” The $400 you save this month becomes $1,200 next month when the worn linings score the brake drums, requiring drum replacement as well.
Deferred maintenance doesn’t eliminate costs. It concentrates and multiplies them in the future, usually at the worst possible time — when the truck is loaded, far from the yard, and on a schedule that doesn’t have any slack in it.
At minimum, every fleet operator should track these numbers monthly:
These numbers tell the story. A truck whose cost per kilometer is creeping up is developing a problem. A truck whose utilization is dropping is spending too much time in the shop. A fleet whose average downtime per breakdown is increasing has a parts availability or mechanic capacity problem.
Here’s where parts sourcing strategy shows up directly in your TCO numbers. A fleet that sources parts purely on price will have a lower parts cost line item but a higher unscheduled maintenance line item, higher downtime cost, and potentially higher fuel cost (from engines that aren’t running at peak efficiency).
A fleet that sources parts strategically — genuine or verified Tier 2 for critical components, quality aftermarket for consumables and non-critical items — will have a slightly higher parts cost line item but significantly lower total cost per kilometer when all costs are included.
The difference between a $60 fuel filter and a $15 fuel filter is $45 in parts cost. The difference in total cost per kilometer — accounting for injector life, fuel economy, and engine longevity — is measured in hundreds of dollars per year per truck. The cheaper filter is the more expensive choice. The TCO calculation makes this visible.
Let me walk through real numbers for a theoretical but realistic fleet of five HOWO T7H tractor units running Mombasa-Nairobi-Kampala routes, covering approximately 120,000 kilometers per year per truck.
Annual costs per truck:
| Cost Bucket | Annual | Per KM |
| Fuel (3.2 km/L at $0.95/L) | $35,625 | $0.297 |
| Maintenance and Parts | $14,400 | $0.120 |
| Tyres | $8,400 | $0.070 |
| Driver and Staff | $14,000 | $0.117 |
| Fixed Costs | $18,000 | $0.150 |
| TOTAL | $90,425 | $0.754 |
At an average freight rate of $0.85 per ton-kilometer and a typical payload of 28 tons, the truck generates roughly $28.56 per loaded kilometer. Assuming 85% loaded utilization (102,000 loaded km per year), gross revenue is about $116,000 per truck per year. Net profit: approximately $25,600 per truck per year.
Now reduce the maintenance budget by 25% by buying cheaper parts and deferring scheduled maintenance. The maintenance line drops from $14,400 to $10,800 — saving $3,600. But the fuel consumption creeps up 5% (from 3.2 to 3.04 km/L, costing an extra $1,800 in fuel), unscheduled breakdowns increase from 6 to 14 per year (each costing a day of revenue at $480 per day, for an extra $3,840 in lost revenue), and the truck’s useful life drops from 8 years to 6 years (adding roughly $3,000 per year in accelerated depreciation).
The $3,600 in maintenance savings costs $8,640 in fuel, downtime, and capital cost. Net loss from the “savings”: $5,040 per truck per year. Times five trucks: $25,200 per year out of the fleet owner’s pocket.
This is why TCO matters. The cheapest parts invoice is not the cheapest fleet.
You don’t need enterprise software to track TCO. A spreadsheet works fine for fleets up to about 20 trucks. The important thing is consistency — track the same metrics the same way every month, separate preventive costs from repair costs, and review the trends quarterly.
The fleet operators who make money are not the ones with the newest trucks or the biggest contracts. They’re the ones who know their numbers. They know what each truck costs per kilometer, they know what each kilometer earns, and they make sourcing and maintenance decisions based on total cost, not on the price of the individual invoice in front of them.
If you’re not tracking TCO, start this month. A notebook and a calculator are all you need. The uncomfortable truth that emerges from the numbers is far less expensive than the comfortable ignorance of not knowing.
Because you can’t manage what you don’t measure, and in the trucking business, what you don’t measure is probably costing you more than you think.
