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Key takeaways
- Diesel leaves a fleet in a few familiar ways: hosed out of a parked tank, held back at the pump for cash, or buried in a padded invoice a station prints on request.
- Your factory fuel gauge cannot catch any of this. It reads voltage off a bouncing float, so a quiet driver knows how to game it.
- A calibrated sensor reads the real litres inside the tank. It notices when the level falls while nobody is driving, and it checks whether a refuel matches its receipt.
- Otrac fuel monitoring is ₦649,900 per vehicle in year one and ₦79,900 a year to renew, set against diesel that walks off your fleet every week.
You buy the diesel. Your driver decides how much of it actually does work.
Every fleet owner in Lagos knows the feeling. The trucks ran the same routes as last month. The mileage barely moved.
But the fuel bill climbed again.
The gap between what you paid for and what the engine burned is where the money goes. And most of the time, it does not disappear by accident.
Where the diesel actually goes
Siphoning is the oldest method. A driver parks for the night near Apapa, drops a hose into the tank, and sells off twenty or thirty litres to whoever is buying on the street.
The tank still reads low when he gets back, so nobody asks questions. He blames traffic and the Lagos-Ibadan Expressway.
Short-filling is quieter. The driver tells the attendant to put in sixty litres but only takes forty, then splits the difference in cash. The receipt says sixty.
Inflated receipts are the third one. A friendly station prints a fat invoice, the driver brings it to you for reimbursement, and the two of them share what you overpaid.
None of this shows up on a dashboard fuel gauge. That gauge is a guess at the best of times, and on a truck that has run for ten years it is barely that.
Why the gauge cannot help you
The factory fuel gauge measures voltage off a float that bounces around every time the truck climbs a bridge or brakes hard in Oshodi.
It was built to tell the driver he is getting low. It was never built to tell you, the owner, exactly how many litres are in the tank at 2am while the truck is parked.
So a driver who knows the gauge is lazy will use that. He moves fuel while the engine is off, and the number on the dash settles back to something believable by morning.
You cannot manage what you cannot measure, and a factory gauge is not a measurement. It is a rough idea your driver already knows how to game.
What a calibrated sensor does instead
Otrac fuel monitoring works on a different idea. We fit a calibrated sensor that reads the real level inside the tank, then we map that reading to your exact tank shape so a litre on the screen is a litre in the truck.
From there the system watches for two things.
The first is the level falling when the truck is not being driven. That points to siphoning, and the alert lands on your phone stamped with when and where it took place.
The second is the refuel. When the truck fills up, the sensor shows how many litres actually entered the tank. If the receipt says sixty and the tank only rose by forty, you know before the driver ever hands you the paper.
That second check is the one that ends short-filling and fake receipts for good. The numbers stop being your driver's word against your gut.
Fuel monitoring inside a managed fleet
Fuel monitoring is strongest when it sits inside fleet management, not on its own.
On one screen you see every truck live, where it stopped, how long it idled, and the fuel line for each unit next to its route. A drop near Apapa at midnight reads very differently when you can also see the truck was parked there for three hours.
For long-haul trucks running between depots, pair it with truck tracking so the fuel data and the location data tell one story instead of two.
Diesel theft and route abuse usually travel together. The driver selling fuel is often the same one taking a personal detour, and one screen catches both.
If your trucks load out of Apapa, this is where the losses are heaviest, because that is where the buyers are.
The honest part about cost
Otrac fuel monitoring is ₦649,900 per vehicle in year one. That price includes the calibrated sensor and the install, and it renews at ₦79,900 a year after that.
It is not cheap, and I will not pretend it is. The reason it is priced where it is comes down to the sensor and the calibration work, which is what makes the readings trustworthy instead of decorative.
Set that against what walks out of your tanks every week. A fleet losing thirty litres a truck across ten trucks is bleeding real money long before year one is over.
Diesel sold off your fleet is also fuel that left the legitimate downstream chain the NMDPRA regulates. The street market that buys it from your driver runs on exactly that kind of leakage.
The point of the sensor is simple. You stop paying for diesel that never moved a single load.
