Rajan Wilcox
Tractor-semitrailers that weigh 80,000 pounds can waste a significant amount of fuel while idling. Idling occurs when a driver leaves their vehicle running while it is parked, for instance, when making a quick stop or stuck in traffic. A semi-truck can burn 0.6 to 1.5 gallons of fuel per hour when idling, costing drivers around $40-$60 a night. This practice is not only expensive but also harmful to the environment and the health of the driver.
| Characteristics | Values |
|---|---|
| Average fuel consumption per hour during idling | 0.6 to 1.5 gallons |
| Average fuel cost per hour during idling | $50 per night or $350 per week |
| Average idle time in a year | 1,800 hours |
| Average fuel cost per night during idling | $40-$60 |
| Cost of Auxiliary Power Units (APUs) | $8,500 to $13,000 |
| Return on Investment (ROI) for APUs | 2.5 years |
| Average fuel cost difference for drivers who don't follow fuel efficiency tips | $1,000 per week |
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What You'll Learn
Idling costs and health implications
Idling a tractor-trailer can waste a significant amount of fuel, with some sources estimating a range of 0.6 to 1.5 gallons of fuel per hour, averaging around 0.8 gallons per hour. This can result in costs of around $40-$60 per night, or over $350 per week, depending on fuel prices. This has a direct financial impact on both individual truckers and trucking companies, as the fuel used during idling reduces the fuel available for driving, leading to more frequent refuelling stops.
In addition to the financial costs, idling has negative health and environmental implications. The exhaust fumes released during idling contain harmful toxins, carcinogens, and greenhouse gases, which have been linked to respiratory issues, cancer, and other diseases. These emissions contribute to climate change and negatively impact the health of drivers and individuals nearby.
To mitigate the costs and health risks associated with idling, truckers can invest in Auxiliary Power Units (APUs) or alternative power sources, such as inverters, bunk heaters, or generators. While APUs have a high upfront cost, they can provide power for appliances without idling the truck, saving fuel and reducing emissions over time. Proper trip planning is also crucial in reducing idling time, as it helps drivers avoid unnecessary extra miles and identify efficient routes, breaks, and fuelling stops.
Furthermore, maintaining a constant speed and minimizing rapid acceleration can improve fuel efficiency and reduce overall fuel consumption. Keeping the tractor-trailer in good condition, including fixing body damage and ensuring proper tyre maintenance, can also improve aerodynamics and fuel economy. By implementing these measures, tractor-trailer operators can reduce the costs, environmental impact, and health risks associated with idling.
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Reasons for idling
Idling refers to leaving a tractor-trailer's engine running while the vehicle is stationary. Long-haul tractor-trailers often idle for about six hours daily, or 1,800 hours per year, though this varies. Idling is generally discouraged due to its negative impact on fuel efficiency, maintenance costs, the environment, and driver health. However, there are several reasons why drivers may choose to idle their tractor-trailers.
Driver Comfort
Long-haul truck drivers often spend extended periods living and working in their vehicles. Idling helps maintain a comfortable temperature in the cabin, especially during extreme weather conditions. A warmed-up or cooled-down cabin can significantly enhance a driver's comfort and quality of life on the road.
Safety and Visibility
Idling can be crucial for safety. For example, a driver parked in a hazardous location or alongside a busy highway may keep the engine running to ensure visibility through the use of lights and flashers.
Cargo and Operations
Some trucking operations require idling during loading and unloading cargo. Refrigerated trailers, for instance, need to maintain specific temperatures for perishable goods. Additionally, specialised equipment, such as hydraulic lifts, may require power from the truck's engine.
Vehicle Maintenance
In cold conditions, idling can warm up the engine, reducing potential mechanical issues associated with starting a cold engine. This practice can help lower wear and tear on the engine.
Powering Electronic Equipment
Idling may be necessary to power electronic equipment or work machinery. This includes powering essential systems like air conditioning, heating, and entertainment devices.
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How to avoid idling
While idling is sometimes necessary, it can waste a lot of fuel and money, damage the engine, and cause harmful emissions. Here are some ways to avoid idling:
Plan Your Trip
Trip planning is crucial to saving money on fuel. Knowing where you will stop for breaks, refuelling, and parking for the night will reduce the risk of driving extra miles and wasting fuel. Planning your trip also helps you to avoid unexpected traffic and construction, which may cause idling.
Install an Auxiliary Power Unit (APU)
An APU can provide enough power to run appliances like the air conditioning, heater, and TV without idling the truck. While the upfront cost is high (around $8,500 to $13,000), an APU can save money in the long run and has a return on investment of about 2.5 years.
Turn Off the Engine
If you need to wait for more than 10-20 seconds, turn off your engine. Contrary to popular belief, it wastes more fuel to sit and idle than to restart the engine.
Drive to Warm Up the Engine
Rather than idling to warm up the engine, start driving as soon as the engine is ready. Driving will heat up the interior of the truck faster, and you won't waste diesel or time.
Park for Best Airflow
If idling is necessary, try to park crossways to the wind direction. This helps blow away any fumes lingering underneath the truck.
Check Your Vehicle
Regular maintenance and checks can ensure your truck is running efficiently and avoid unexpected issues that may cause idling. Check your tires, fix any body damage, and control your speed to increase fuel efficiency.
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Trip planning
Before you set off, look up how much fuel prices are in the areas you'll be driving in, and plan to stop at the more affordable truck stops. When you're fuelling up, pay attention to how much fuel you're putting in. Fuel expands when it gets hot, so if you fill your tank to capacity, some fuel may seep out as you drive.
As well as planning where to stop for breaks and fuel, you can also plan to avoid idling in traffic. Utilising route optimisation technology can help you plan routes strategically to minimise time spent idling in traffic.
It's also worth bearing in mind that idling is more likely to occur when it's very hot or very cold. So, if you're trip planning, you can try to avoid routes where extreme temperatures are likely. If you're driving in extreme weather, you might want to invest in an Auxiliary Power Unit (APU) or other alternatives to idling, such as an inverter, bunk heater, or generator. These can help to provide heat or power devices without idling your truck.
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Engine damage and maintenance
Idling can have a detrimental effect on tractor-trailer engines, leading to increased wear and tear and a shorter engine lifespan. This is due to several factors, including the high temperatures and low engine RPM associated with idling.
Firstly, idling can cause engine wear due to low engine RPM. When idling, the engine operates at a low RPM, which can lead to insufficient oil pressure. This, in turn, causes friction and increased engine wear. To mitigate this, it is recommended to maintain an RPM between 900 and 1200 when idling to ensure adequate oil circulation and reduce engine wear.
Secondly, idling can lead to incomplete combustion, particularly in diesel engines, resulting in cylinder washing, wet stacking, and oil dilution. This is exacerbated by cold cylinder temperatures, which are common during idling. Incomplete combustion can also clog the particulate filter, leading to further issues.
Additionally, idling can cause exhaust gases to enter the crankcase, shortening oil life and potentially damaging internal engine components. This is a common issue in diesel engines, and it can lead to increased maintenance requirements and reduced engine lifespan.
Furthermore, idling can impact the emissions system, particularly in modern diesel engines with advanced emissions controls. Prolonged idling can lead to the accumulation of soot and other particulates in the diesel particulate filter (DPF), requiring more frequent regeneration and maintenance.
To address these issues, tractor-trailer operators can employ several strategies. One common approach is to utilize an Auxiliary Power Unit (APU), which provides power for heating, cooling, and other amenities without running the main engine. APUs can significantly reduce idling time and associated engine wear, fuel consumption, and emissions. Another option is to use power inverters or bunk heaters, which provide alternative power sources for comfort amenities, reducing the need for idling.
By understanding the impact of idling on engine maintenance and utilizing appropriate strategies to minimize idle time, tractor-trailer operators can help extend engine lifespan, reduce maintenance costs, and contribute to more environmentally friendly practices.
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Frequently asked questions
A tractor-trailer that weighs 80,000 pounds wastes around 0.64 gallons of fuel per hour when idling without a load and 1.15 gallons per hour with a load.
Depending on fuel prices, idling can cost tractor-trailer drivers around $40-$60 per night, or over $50 per night, which amounts to $350 per week.
Idling releases harmful chemicals, toxins, and greenhouse gases into the atmosphere, contributing to climate change and leading to respiratory problems and other diseases.
Alternatives to idling include investing in an inverter, bunk heater, auxiliary power unit (APU), or generator to provide heat or power devices. Truckers can also use braking techniques to minimize unnecessary complete stops and maintain a constant speed to improve fuel efficiency.
