Idle engines are burning money right now

Idle engines are burning money right now

While you read this, there is a vehicle in your fleet with its engine running and its wheels stationary.

That is not an assumption. It is a statistical near-certainty.

Research published by the American Transportation Research Institute, consistently replicated across commercial fleet studies, documents that the average commercial vehicle idles for 1,800–2,400 hours per year. For a diesel engine consuming 3–4 litres per hour at idle, that is 5,400–9,600 litres of fuel per vehicle per year — consumed while the vehicle produces zero output.

At a conservative $1.20 per litre, that is $6,500–$11,500 per vehicle per year in idle fuel spend.

On a 40-vehicle fleet: $260,000–$460,000 annually. Sitting still.

The US Department of Energy documents that long-haul trucks idling overnight for heating or cooling consume 1,500–2,000 litres of diesel per year per truck for that purpose alone — a problem directly applicable to any fleet operating in regions with extreme temperatures, including equatorial West Africa where cab cooling is the primary driver.

The Geotab 2024 fleet benchmarking dataset — drawn from 3.4 million connected vehicles globally — found that fleets in the bottom quartile of idle management idle for an average of 28% of engine-on time. Top quartile fleets idle for 8%.

The 20-percentage-point gap between those two figures, on a fleet spending $800,000 annually on fuel, is $160,000 per year.

The interventions with documented effectiveness

• An idle policy (engine off after 3–5 minutes stationary) reduces idle time by 30–50% within 90 days of enforcement, per Geotab implementation data.
• Telematics-based idle alerts, sent directly to drivers in real time, reduce idle time by an additional 20–30% on top of the policy baseline.

The technology exists. The policy costs nothing to write. The saving is immediate.

Does your fleet have an idle policy? When did you last measure idle time?

Sources

American Transportation Research Institute idle research; US Department of Energy Alternative Fuels Data Center idle fuel data; Geotab 2024 Fleet Benchmarking Report.