Truck Utilization: Why a 100% Full Truck Can Still Cost You More
In short
A truck can leave the depot completely full, achieve 100% utilization, and still be one of the most expensive routes in your network. That is because truck utilization measures only how full the vehicle is at departure, while transportation cost accumulates throughout the entire journey. When utilization becomes the primary optimization target, teams optimize a proxy instead of the business outcome they are ultimately trying to improve: transportation cost.
Key takeaways
- Truck utilization is measured at departure and does not reflect how full the truck stays along the route.
- Transportation cost is driven by resources such as vehicles, distance, time, and contracted rates, not by the utilization percentage itself.
- Two plans can use the same trucks at the same utilization yet have very different transportation costs.
- Truck utilization is a measure of loading efficiency, not planning efficiency.
- Optimize transportation cost directly. Higher utilization usually follows as an outcome, not as the objective.
What is truck utilization?
Truck utilization is the share of a vehicle's available capacity that is filled with freight, usually expressed as a percentage of volume or weight. In most operations, it is recorded at the moment the truck leaves the depot. A truck loaded to 100% at departure is typically reported as fully utilized for that trip.
Truck utilization became popular because it is simple to calculate, easy to compare across operations, and generally correlates with better transportation efficiency. The problem is not the KPI itself. The problem is assuming that maximizing utilization also minimizes transportation cost.
This does not mean truck utilization is unimportant. Well-planned transportation networks often achieve high truck utilization. The mistake is treating utilization as the objective rather than one of several indicators of a good transportation plan.
That is where the misconception begins. Truck utilization is a departure metric, and a departure metric describes only one instant in a journey that may last hundreds of kilometers.
Why truck utilization tells only part of the story
Once a truck leaves the depot, its utilization begins to change with every delivery. Yet the KPI usually remains frozen at the departure value.
Depot to Stop 1
Truck load: 100%
Distance: 80 km
Stop 1 to Stop 2
Truck load: 55%
Distance: 120 km
Stop 2 to Final Stop
Truck load: 20%
Distance: 400 km
Although the trip is reported as 100% utilized at departure, nearly two-thirds of the journey is completed with the truck carrying less than 55% of its capacity.
The transportation cost, however, continues to accumulate over every kilometer traveled. By the final stretch, the truck is covering hundreds of kilometers with very little freight on board.
Truck utilization is a snapshot. Transportation cost is created throughout the entire journey.
What actually drives transportation cost?
Whether transportation is performed by your own fleet or an external carrier, transportation cost is driven by the resources required to move freight, not by the truck utilization percentage.
Typical cost drivers include:
- Vehicle type and operating cost
- Distance traveled
- Driver time
- Fuel consumption
- Contracted rate structures
- Tolls and other route-dependent expenses
Notice what is missing from that list: truck utilization.
A typical transportation invoice is based on resources consumed, not utilization:
- Vehicle/truck charge ✓
- Distance ✓
- Driver time ✓
- Fuel surcharge ✓
- Truck utilization ✗
Truck utilization remains a valuable operational KPI, but it is not what determines transportation cost.
Why truck utilization cannot compare transportation options
Imagine two choices:
- Large truck at 80% utilization
- Smaller truck at 100% utilization
Transportation cost depends on vehicle cost, distance, payload, pricing and route characteristics, not utilization alone.
Two consolidation plans, same utilization, different transportation cost
Plan A: 12 trucks, 92% utilization, 4,200 km, higher transportation cost.
Plan B: 12 trucks, 92% utilization, 3,600 km, lower transportation cost.
Truck utilization cannot distinguish between these plans. Transportation cost can.
An optimization engine minimizing transportation cost will select Plan B. One maximizing truck utilization sees both plans as equally good.
Truck utilization is a measure of loading efficiency, not planning efficiency.
Modern transportation planning optimizes consolidation, vehicle assignment and route optimization together.
What to optimize instead
Build transportation plans that minimize transportation cost by reducing:
- Transportation cost
- Trucks required
- Distance traveled
- Empty and low-value kilometers
- Vehicle operating costs
while maintaining service levels.
Higher truck utilization is usually a consequence of minimizing transportation cost, not the other way around.
The bottom line
Good transportation plans often produce high truck utilization.
High truck utilization does not necessarily produce good transportation plans.
Truck utilization is a measure of loading efficiency.
Transportation cost is a measure of planning efficiency.
If your objective is to spend less, optimize what you pay, not what you measure.
Optiyol's transportation planning platform minimizes total transportation cost by optimizing consolidation, vehicle assignment, and routing together.