How Do Construction Contractors Calculate Fuel Consumption per Shift for Excavators and Loaders?

How Do Construction Contractors Calculate Fuel Consumption per Shift for Excavators and Loaders?

Diesel fuel on construction sites has always been a significant expense.

Excavators, loaders, road rollers, and bulldozers are in operation every day, and the equipment isn’t necessarily parked in the same place. Today they might be in an earthwork area, and tomorrow they could be moved to a road construction site; some are company-owned, while others are rented; fuel refueling may be centrally arranged by the project department, or fuel trucks may deliver it directly to the site. By the end of the month, fuel expense reports, machine-shift reports, and actual construction progress often do not match up.

The most common scenario isn’t that “all the fuel is gone,” but rather that no one can say for sure: exactly how long the equipment ran today, how much fuel was added, or how much fuel it should normally consume.

For general contractors, equipment rental companies, and project managers, the goal of construction equipment fuel consumption management is not to monitor drivers on a daily basis, but to make the fuel usage process for each piece of equipment verifiable, explainable, and traceable.

Why Is It Always So Hard to Keep Track of Diesel Consumption at Construction Sites?

Road transport vehicles typically have fixed routes and daily mileage, but construction machinery is different.

An excavator may dig continuously for more than ten hours, or it may idle in place for long periods while waiting for materials, vehicles, or dispatch instructions; a loader may sometimes be used for high-intensity loading and other times only for occasional transport; a road roller may appear to be running constantly, but fuel consumption varies significantly depending on soil type and slope.

Therefore, you cannot simply use “how much fuel this machine has consumed in a month” to determine whether there is a problem. A more practical approach is to consider the following factors together:

• How many hours has this device been in operation this month?;
• At the beginning and end of each shift, check whether the change in fuel level is normal;
• Do the refueling records match the changes in the fuel tank level?;
• During downtime, at night, or outside of construction hours, is there any abnormal fuel loss?
• Is the difference in fuel consumption too significant among devices of the same model under similar operating conditions?

When viewed this way, many questions don’t require guesswork—the data itself provides the answers.

Don’t rush to directly compare fuel consumption per shift with other devices just yet.

When many project teams see that a particular excavator has high fuel consumption, they immediately assume the operator is at fault or suspect there are gaps in diesel management. In reality, this is not necessarily the case.

Take two 20-metric-ton excavators, for example: one is loading material in loose soil, while the other is breaking up hard soil—naturally, their fuel consumption will differ. Similarly, for two loaders, one handling short-distance material transport and the other frequently traveling up and down slopes will also show significant variations in fuel consumption.

When comparing fuel consumption per shift, we recommend first categorizing the data based on several criteria:

• Equipment models and service life;
• Construction site locations and construction processes;
• Operation types, such as excavation, loading, grading, and compaction;
• Actual working hours for the day;
• Is there prolonged idling or downtime?

First establish a “normal range,” then examine devices that fall outside it; this will significantly improve management efficiency.

For example, consider two loaders of the same model at the same construction site. If their tasks are similar and their operating hours are roughly the same, but one of them consistently shows significantly higher hourly fuel consumption over several days, this warrants further investigation. It could be that the operator has left the engine running for extended periods, or that the equipment’s engine requires maintenance; of course, it’s also possible that the refueling or fuel issuance records have not been properly documented.

Before the shift: First, match the day’s equipment to the tasks.

Before work begins each day at the construction site, there’s no need to fill out complicated spreadsheets. The equipment supervisor simply needs to match the equipment scheduled for the day with the drivers or operators, work areas, and tasks—this will make the subsequent reconciliation process much easier.

For example:

• Excavator No. 1: Loading in the earthwork area;
• Loader No. 2: Sand and gravel transfer;
• No. 3 Road Roller: Road compaction;
• Excavator No. 4: Idle, awaiting material.

That way, when you review fuel consumption at the end of the month, you won’t wonder, “Why did this unit consume so much fuel today even though it barely moved?” Because you’ll be able to confirm first whether it was actually in operation or simply on standby at the site.

This step is also crucial for equipment rental companies. When equipment is transferred between different customers and projects, keeping accurate records of the work locations and time periods will make it easier to calculate rental hours and fuel liability later on.

During the shift: The focus isn’t on the fuel level itself, but on whether the changes in fuel level make sense.

Fuel level monitoring for construction machinery involves more than just checking a single remaining fuel level reading.

What’s truly useful is observing the patterns of change: when fuel is added, when consumption continues, and when the equipment is idle but the fuel level drops significantly. By correlating these changes with operating hours and equipment status, many anomalies can be easily identified.

For example, if a excavator operates continuously during the day and the fuel level drops slowly, this is normal; however, if the fuel level drops significantly within a short period after the machine is shut down in the evening, the project department needs to investigate. This could be due to normal fuel transfer, fluid drainage during maintenance, or improper fuel tank handling—or it could indicate a security breach in nighttime management procedures.

Similarly, if the fuel level does not increase accordingly after refueling, you should not jump to conclusions. First, check the refueling records, the fuel tank capacity, whether the equipment is on an inclined surface, and whether the fuel level calibration is accurate before making a judgment. Construction machinery fuel tanks are not always perfectly regular in shape, and the angle at which the equipment is parked can also affect fuel level readings; therefore, the data should be interpreted in light of the on-site conditions.

After the shift: Match the “fuel—labor hours—shift” pairs.

At the end of the day, what matters most to a machinery supervisor isn’t a pile of graphs, but a few simple questions:

• How long has this device been running today?
• By approximately how much has the fuel level decreased?
• Was there a refueling stop along the way?
• Are there any unreasonable fluctuations in fuel levels during non-operational hours?
• Does this device have a significantly higher hourly fuel consumption compared to similar devices?

Converting fuel consumption to a per-hour rate is usually more meaningful than simply looking at how many liters are used per day.

For example, if a piece of equipment consumes 120 liters of diesel in a single day, the number alone is meaningless; however, if it actually operates for 10 hours—at a rate of approximately 12 liters per hour—this data can be compared with equipment of the same model and similar construction processes. Over time, the project team will gradually establish its own reference range.

This is the most practical aspect of fuel consumption accounting for construction machinery: rather than applying a single fixed figure to all equipment, you gradually establish a set of actionable standards based on your specific job sites and equipment.

In which situations should these issues be investigated first?

We recommend that mechanical supervisors or project managers review the following categories first:

1. Fuel level suddenly drops after being parked overnight

The equipment had finished operating, and the next morning it was discovered that the fuel level was significantly lower than the previous night. In this situation, it is necessary to verify the nighttime construction schedule, security patrol logs, and on-site fuel operation records.

2. Discrepancies between refueling records and fuel tank levels

Gas station receipts show that fuel was dispensed, but the fuel level on the device has not changed significantly; or the fuel level has increased significantly, yet there is no corresponding fuel withdrawal record. Such situations are not necessarily due to human error—they may also be the result of an oversight in record-keeping—but they must be corrected promptly.

3. Excessive variation in fuel consumption per unit of labor for devices of the same model

On the same construction site and under similar operating conditions, if a piece of equipment consistently shows higher-than-normal fuel consumption over several consecutive days, it is recommended to review idle time, operating habits, equipment maintenance, and workload.

4. Fuel levels fluctuate repeatedly even when the device has been parked for an extended period

Idle equipment is most easily overlooked. In particular, equipment temporarily parked at the edge of a construction site, in a material yard, or at a remote construction site should be included in the project team’s regular inspection checklist.

5. Unclear fuel levels during the handover of leased equipment

When equipment is delivered, relocated, or returned, the absence of clear fuel level records can easily lead to disputes later on, such as “Who refueled it?” or “Who used the fuel?” Keeping accurate records of handover times, equipment status, and fuel levels can save a lot of communication effort.

Fuel consumption management for construction machinery is not about assigning blame.

Project teams that perform well typically do not treat fuel consumption data merely as a tool for “identifying problems.”

Fuel consumption data can also help managers assess a variety of factors: whether a piece of equipment has been idling for an extended period, whether the work organization at a construction site is reasonable, whether equipment is due for maintenance, whether rental shifts are accurate, and whether fuel deliveries need to be scheduled in advance.

Especially when multiple construction sites are operating simultaneously, it is impossible for project managers to visit every piece of equipment every day. Through standardized record-keeping and monthly reviews, they can focus their attention first on equipment and projects that actually exhibit anomalies.

This not only reduces the need for repeated on-site meter readings but also minimizes unnecessary disputes among equipment operators, fuel managers, and project teams.

A Practical Method for Monthly Retrospectives

At the end of each month, you can create a simple summary table by device, focusing on retaining these five items:

1. Actual working hours for this month;
2. Total fuel volume for this month;
3. Estimated consumption for this month;
4. Average fuel consumption per hour;
5. Number of abnormal fuel level changes or unexplained incidents.

There’s no need to aim for particularly complex reports right from the start. Just keep records for two or three months, and you’ll be able to identify the general fuel consumption patterns for each device. This will provide a more reliable basis for subsequent project settlements, lease settlements, and equipment maintenance.

Which organizations are suitable for calculating fuel consumption in construction machinery?

This management approach is particularly well-suited for:

• General contractors for earthwork and road construction;
• Excavator, loader, and road roller rental companies;
• Municipal engineering and landscaping contractors;
• Construction contractors with multiple job sites operating simultaneously;
• Mining companies, sand and gravel yards, and building materials companies that own heavy machinery.

This approach works even if you have only a few pieces of equipment. Even if you have just 5 or 10 machines, as long as diesel expenses account for a significant portion of your costs, simply matching fuel consumption with machine hours will make management much easier.

Frequently Asked Questions

Should fuel consumption for construction machinery be calculated on a daily or hourly basis?

Both methods are valid, but calculating based on actual operating hours is generally more meaningful. Since different pieces of equipment have varying daily operating times, relying solely on daily fuel consumption can lead to misjudgments. For long-term management, we recommend focusing on hourly fuel consumption and comparing it in conjunction with construction processes.

If an excavator is parked on a slope, will the fuel level data be inaccurate?

It is possible. The shape of the fuel tank, the tilt angle of the device, and fuel sloshing can all affect short-term readings. Therefore, when determining whether refueling has occurred, there is an abnormal fuel loss, or assessing fuel consumption, it is best to consider the device’s parking status, the time period, and continuous trends—rather than drawing conclusions based solely on data from a single moment.

If you notice a drop in fuel levels overnight, does that necessarily mean fuel has been stolen?

Not necessarily. It could be due to routine fuel transfers, maintenance, equipment relocation, or an omission in the records. The correct procedure is to first review the time, location, on-site operation records, and equipment status, and then arrange for an on-site verification. The purpose of the data is to help managers identify situations requiring explanation as quickly as possible.

Once the equipment is leased out, what is the best way to account for fuel costs?

We recommend maintaining records of the equipment’s time, fuel level, and operational status upon arrival, handover, relocation, and departure; then perform daily calculations based on actual machine shifts or labor hours. This approach allows for a clear breakdown of rental fees, fuel costs, and equipment usage.

Is it really necessary for small construction crews with only a few pieces of equipment to manage fuel consumption?

It’s necessary. Small construction crews often don’t have dedicated fuel managers, which makes diesel expenses more likely to become a murky expense. By starting with fueling records, working hours, and changes in fuel levels during downtime, you can resolve most day-to-day issues.

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