Fuel Monitoring Solutions for Road Freight and Logistics Fleets

Anyone in the logistics industry knows that the real challenge in managing a fleet is often not the vehicles themselves, but the fuel.

A truck travels hundreds of kilometers a day—refueling at a rest stop today and unloading cargo in a different location tomorrow—with the driver, fuel card, receipts, mileage, and remaining fuel levels all in different places. When reconciling accounts at the end of the month, a common scenario is this: the books look fine, but fuel levels are lower than expected; drivers cite traffic jams, detours, or idling with the AC on, and it’s difficult to immediately determine whether their explanations are true or false.

For long-haul trucking fleets, fuel typically accounts for 30% or more of operating costs. If each vehicle uses just a few dozen liters of fuel more than expected each month, the cumulative loss across dozens of vehicles adds up to a significant amount.

FOFN’s fuel monitoring solution for logistics fleets makes it possible to see, track, and reconcile exactly “where the fuel went.”

The Three Most Common Fuel-Related Issues in Logistics Fleets

1. Fuel theft along the way, discovered only at the end of the month

Some vehicles experience fuel theft while parked at service areas, parking lots, or loading/unloading points. Previously, the only option was to wait for the driver to return and conduct a fuel inventory at the end of the month; even if a shortage was discovered, there was no evidence of the time or location, making it very difficult to resolve the issue.

After installing the fuel level sensor, the platform will continuously record the fuel level curve. During normal driving, the fuel level should decrease gradually; if a sudden, significant drop occurs while the vehicle is parked, the system will record the time, location, vehicle status, and fuel level change, making it easy for managers to review the data later.

2. When refueling at a different location, the amount paid and the amount of fuel do not match.

Long-haul trucks traveling across provinces and regions often have fuel card transactions and paper invoices scattered across different locations. When drivers report how many liters they refueled and how much they paid, it is difficult for managers to verify each transaction individually.

Fuel monitoring records changes in fuel level before and after each refueling, calculates the actual amount of fuel added, and then cross-checks this data against fuel card charges, refueling receipts, and gas station locations. This approach focuses not just on “how much was spent,” but on “how much fuel actually went into the tank.”

3. High fuel consumption at idle; the car hasn’t been driven, but the fuel level keeps dropping.

Some vehicles spend long periods of time parked on the side of the road waiting for cargo, with the air conditioning running or waiting in line for loading and unloading, with the engine running but the vehicle not moving. On the surface, it does not appear that fuel is being stolen, but in reality, fuel consumption while idling is very high.

By combining fuel level data with GPS tracks, ACC status, and parking duration, the system can identify fuel consumption resulting from prolonged idling. Managers can distinguish between normal waiting times (e.g., for deliveries), traffic jams, cold chain refrigeration, and unreasonable idling—no longer relying solely on drivers’ explanations.

What parts make up the proposal?

A standard fuel monitoring system for logistics fleets typically includes:

• Capacitive fuel level sensors, installed inside the vehicle’s fuel tank, continuously measure the actual fuel level;
• 4G GPS tracking device that uploads location, travel routes, ACC, speed, and fuel level data;
• The FOFN Fleet Management Platform or the customer’s own platform;
• Optional modules for fuel card, invoice, and gas station data reconciliation;
• Alarm rules for abnormal fuel loss, refueling, low fuel levels, prolonged idling, and other conditions.

For trucks with irregularly shaped fuel tanks, dual fuel tanks, or large-capacity fuel tanks, you must first confirm the fuel tank dimensions and installation location before proceeding with refueling calibration. The more accurate the calibration, the more valuable the subsequent fuel consumption analysis will be.

What does the platform focus on monitoring?

Real-time Fuel Level Curve

Managers can view fuel level trends for each vehicle. Normal consumption typically results in a gradual decline; refueling causes a noticeable increase; a sudden drop while the vehicle is parked warrants special attention.

Refueling and Unusual Fuel Loss Incidents

Every time fuel is added or a suspected fuel withdrawal occurs, the system records the time, location, change in fuel level, and vehicle status. For vehicles with suitable fuel tanks and properly installed and calibrated sensors, the threshold for abnormal fuel level drops can be set according to actual management requirements—for example, a fuel level change of 5 liters or more.

It should be noted that the speed at which alerts are triggered is affected by the device’s reporting interval, local cellular network conditions, and platform rules. A reasonable approach is not to focus solely on “second-level” alerts, but rather to set alerts to a level that is truly practical based on the vehicle’s route, fuel tank capacity, and network conditions.

Linkage Between Route Data and Fuel Consumption

Did the fuel level drop because the vehicle was in motion, or while it was parked? By comparing the fuel level graph with the vehicle’s track data, the answer becomes much clearer.

The system helps fleets verify:

• Are there any detours or unscheduled stops?;
• At which parking locations have abnormal fuel level drops occurred?;
• Is the average fuel consumption for a particular route, a specific type of cargo, or a particular driver abnormally high?;
• Are there any unusual differences in fuel consumption among vehicles of the same model?

Reconciliation of Fuel Cards and Invoices

Monthly reports on refueling records, fuel level changes, mileage, and fuel consumption can be exported by vehicle. Managers can use the actual fuel volume dispensed to verify fuel card transactions and invoice amounts, thereby reducing issues such as “fuel dispensed but not received in the tank” or “discrepancies between the amount charged and the fuel volume.”

What benefits does this solution offer to fleets?

First of all, it’s not meant to keep tabs on drivers, but rather to provide a basis for fuel management.

Once every refueling, every instance of abnormal fuel loss, every route, and every period of idling is recorded, management tasks will become much simpler:

• In the event of abnormal fuel loss, the time and location can be traced;
• For out-of-location refueling, the actual amount of fuel dispensed can be verified;
• For vehicles with high fuel consumption, comparisons can be made with other vehicles on the same route;
• In cases of prolonged idling, it is possible to distinguish whether this is due to business needs or management oversights;
• Month-end reconciliation will no longer be based solely on fuel card balances, but rather on actual fuel consumption.

In logistics projects with relatively lax management, transparency in fuel consumption data can typically help fleets reduce unreasonable fuel consumption and fuel loss. The actual savings rate depends on the number of vehicles, routes, fuel prices, driver management, and the severity of existing issues; therefore, a fixed figure cannot be simply guaranteed. However, for fleets with high fuel expenses, a large number of vehicles, and long routes, the potential for improvement is often significant.

Which vehicles is it suitable for?

• Long-haul logistics trucks and heavy-duty freight vehicles
• Refrigerated trucks and box trucks
• Urban Delivery Fleet
• Hazardous Materials Transport Vehicles and Tank Trucks
• Cross-border transport vehicles
• Transportation fleets for building materials, minerals, and agricultural products
• Logistics operators with their own platforms that require API or protocol integration

How do we implement overseas projects?

In markets such as Tanzania, Ghana, South Africa, the Philippines, Vietnam, Indonesia, the Middle East, and Central Asia, where long-distance transportation is common and refueling points are scattered, fuel-related issues are also prevalent. Before implementing a project, it is recommended to first confirm:

• Local 4G/2G network coverage and major carriers;
• Vehicle fuel tank material, length, shape, and quantity;
• Is simultaneous monitoring of both fuel tanks required?;
• Whether fuel cards are used, and whether fuel card reports are needed for reconciliation;
• Should the platform use the FOFN platform, or integrate with the customer’s existing system?
• Is local installation support or remote installation guidance required?

FOFN offers fuel level sensors, GPS terminals, open protocols, API integration, and project installation recommendations, allowing logistics companies to start with a pilot installation on a small number of vehicles and then gradually expand to their entire fleet.

Frequently Asked Questions

Why Do Logistics Fleets Need Fuel Level Monitoring?

Since the balance on a fuel card only indicates how much money was spent, it cannot prove whether the fuel actually entered the tank, nor can it determine whether the vehicle’s fuel consumption was normal or if fuel theft occurred. Fuel level monitoring combines refueling, fuel consumption, abnormal fuel loss, and vehicle tracking data, making it easier to verify these details.

Can a GPS tracker detect fuel theft on its own?

It is not possible to determine this with complete accuracy. GPS can tell managers where a vehicle is and how long it has been parked, but it cannot directly indicate how much fuel has been depleted from the tank. To distinguish between refueling and fuel theft, a fuel level sensor must typically be used in conjunction with the GPS terminal.

How many liters of fuel theft can the fuel monitoring system detect?

Detection accuracy depends on the fuel tank’s shape, sensor precision, installation location, and the quality of calibration. For truck fuel tanks that meet the appropriate conditions, an abnormal fuel loss threshold of 5 liters or more—or a threshold tailored to project requirements—can be set. The more irregular the fuel tank’s shape, the more critical proper calibration becomes.

Can we verify whether trucks refuel across state lines?

Yes. The system records changes in fuel levels before and after refueling, as well as the time and location of refueling, and then cross-checks this data with fuel card transactions, invoices, and driver reports. It is particularly well-suited for long-distance, cross-regional transportation.

Can fuel levels still be monitored on remote routes without internet access?

For routes with unreliable internet connectivity, Bluetooth fuel level sensors with local storage capabilities can be used to first record fuel level, refueling, and fuel loss data, which staff can then periodically retrieve using their mobile phones. For vehicles requiring remote real-time alerts, we recommend configuring 4G GPS terminals with IoT SIM cards suitable for the local area.