The time an engine spends idling is equivalent to the amount of fuel it consumes; the more idling, the higher the fuel expenditure
The beginning of September has not halted the high temperatures, and as they rise, so do costs in the road transport sector. According to data shared by FleetOwner, the transport platform Samsara reveals that engine idling increases with temperatures above average, which can lead to higher fuel costs.
Samsara analysts studied commercial vehicle data during three heat waves in Oregon, Arizona, and Washington, as well as in nine northeastern states, between June and August 2023 and June and July 2024. Using daily temperature data from the National Oceanic and Atmospheric Administration, they found that the proportion of time spent idling increases with high temperatures. In Arizona, temperature explains 84% of the variation in idling time, and in the Northeast, 88%. During a heat wave in the Pacific Northwest in 2023, idling and high temperatures showed a strong correlation, and in June this year in the Northeast, the trend was similar.

Idling costs during heat waves
The time an engine spends idling is equivalent to the amount of fuel it consumes; the more idling, the higher the fuel expenditure. Based on Samsara’s analysis, it was estimated that major carriers in the Pacific Northwest incurred an additional million dollars in fuel costs during a heat wave in August of last year, assuming an average price of $4 per gallon of diesel, with a consumption of 0.85 gallons of fuel per hour of idling during an 8-hour shift.
By the same measure, Samsara estimated that during the heatwave of June 2024, road transport companies in the Northeast spent over $4.5 million on additional fuel in just one week.
Aside from the increased fuel consumption due to extended idling times, trucks emitted more greenhouse gasses into the atmosphere. In the Pacific Northwest, commercial vehicles emitted 5.9 million pounds of CO2 more than usual. Commercial vehicles in the Northeast contributed a staggering 24.4 million pounds of emissions.

Preparing for a future with high temperatures
With the rise in heat episodes, many organizations are prioritizing adaptation: from using real-time data to develop strategies that minimize the impact of heat, to technology that provides specific solutions for idling, improving employee safety while reducing fleet emissions. Similarly, the public and nonprofit sectors are also active in planning for extreme heat; for example, the State of Arizona has appointed a Heat Protection Chief, and the Adrienne Arsht-Rockefeller Foundation provides resources for developing action plans.
Although it is still early to determine if 2024 will be the hottest year on record, organizations can act now to understand and mitigate the effects of heat on fuel efficiency. For instance, they might consider implementing lighter paint on tractors to reduce heat absorption, improving cabin insulation, using auxiliary power units to power HVAC systems, among other measures.

Jerome Powell under investigation as tensions between Trump and the Fed escalate
The investigation into Powell has raised global concerns over a potential threat to the independence of the U.S. central bank. In the new episode of

Road Alert: 25 States Under Extreme Driving Conditions
Road Alert: 25 States Under Extreme Driving Conditions
Snow, ice, strong winds, and low visibility are keeping major highways under active travel advisories. The alert now affects 25 states and calls for extra caution, especially among truck drivers and freight carriers operating along key corridors.

Human Trafficking: A Nationwide Call to Action on America’s Roads
Human trafficking is the focus of a nationwide awareness week aimed at educating truck drivers, motor carriers, law enforcement, and the public about human trafficking, how to spot the warning signs, and what to do if someone may be in danger.

TAA Compliance: When Safety Complaints Turn Into Six-Figure Losses
STAA compliance is no longer a technical detail for fleet owners—it is a financial, legal, and insurance exposure. A recent enforcement action in Texas shows how mishandling safety complaints can lead to termination claims, retaliation findings, and six-figure penalties, and what carriers must do to avoid becoming the next case

U.S. labor market raises red flags on Wall Street
The U.S. labor market closed 2025 with clear signs of weakening, as evidenced by the latest employment data released in December. In the latest episode

DOT finds half of North Carolina CDLs were issued illegally
The DOT warns that half of North Carolina’s CDL licenses are irregular after a federal audit uncovered serious compliance failures. The findings directly affect truckers, fleets, and transportation companies, raising urgent questions about road safety, legal operations, and the future of the trucking industry.