How Much Fuel Does Idling Waste? What Engine Idling Means for Your Fuel Tank

There are some serious implications of engine idling when it comes to fuel efficiency. Excessive motor vehicle idling leads to increased fuel consumption which not only increases wear on engine components and shortens vehicle life, but also negatively impacts the environment. Fortunately, there are ways to reduce unproductive engine idling. In this article we’ll discuss why idling engines can cost you a lot and are bad for the environment, and some potential solutions for fleet managers. 

What is engine idling? 

“Idling” refers to running a vehicle’s engine when it’s not moving, such as when you’re at a red light, stuck in traffic or parked in a spot. Idling is part of driving  and is a fairly common occurrence for most drivers. However, idling may not be the best thing for your vehicle, fuel consumption, or the environment. 

Reducing the amount of time vehicles are idling is a simple way to maintain and even increase fuel economy among fleet vehicles, especially as fuel prices rise. 

Is idling bad for your engine? 

Letting a vehicle idle does more damage to the engine than starting and stopping. In fact, running an engine at low speed (idling) causes twice the wear on internal parts compared to driving at regular speeds. 

“Excessive idling has a negative effect on the engine and exhaust system and increases maintenance costs.” “For instance, extended idle operation may lead to reduced efficiency of engine lubricants (increase in frequency of oil change), engine or spark plug wear/fouling and accumulation of fuel residue in the exhaust system”.

Excessive idling can also cause a buildup of carbon residue in a truck’s engine. Because the engine is not operating at its optimal temperature when idling, fuel is only partially combusted, leading to fuel residue buildup on the cylinder walls. This can further damage engine components, including spark plugs and exhaust systems, increasing maintenance costs and shortening the life of the engine.

Idling and fuel consumption 

Does idling waste fuel? Yes, it does. Idling vehicles can use more fuel than you might realise. This directly affects how much you spend on gas and how often you need to refuel. How much fuel a vehicle consumes while idling depends on factors such as its weight, engine size, and the type of fuel it uses. “Idling can use up to 2 litres of fuel per hour, emitting over 5.26kg of CO2”.

Some countries even have anti-idling laws that restrict engine idling and impose fines on drivers who violate them like the UK, France and Germany. 

Download this free guide to find out effective ways to bring down fuel cost. 

Engine idling and the environment in Australia

Idling and wasting fuel have a serious impact on the environment. The World Health Organisation estimates that air pollution is responsible for 4.2 million deaths each year. Here is what can be said about the situation in Australia, “several studies state that the contribution of motor vehicle emissions to population exposure and associated health effects is substantially greater than one would expect on the basis of their emissions alone”. Additionally, international studies have revealed that “motor vehicles are the largest single contributor to human health effects (PM, ozone), and that emission levels are leveraged by about a factor of three to four when population exposure is considered.” The studies also found that there are practically no idle reduction initiatives or anti-idling legislation in Australia, or at least none could be identified. More people are becoming aware of eco-driving and motorists are being recommended to reduce the time spent idling while parked in order to reduce engine idle fuel consumption. It is also not known whether idle reduction technology is currently being used in Australian on-road vehicles. It has, however, been revealed that Australia does not have fuel efficiency or CO2 emission standards compared to other developed countries such as the EU and USA.

Potential solutions for engine idle reduction 

For many people, reducing excessive idling is a priority, if not a necessity. For instance, though everyone can benefit from fewer idling vehicles on the road, business owners who have to manage their fleet of vehicles stand to save money by reducing idling time.

1. For drivers of small vehicles, it is recommended to turn off your engine if you plan to idle for longer than 10 seconds. It is a common myth that restarting your engine uses more gas and causes engine wear. 
2. Don’t spend time idling to warm up your engine - just start driving. Engines warm more quickly when they are being driven than when idling. 
3. GPS tracking software is one of the possible ways to reduce idling in fleets. This software can be used as idle time tracking software and gathers data about what vehicles and drivers are actually doing, so fleet managers can see if there are any ways to improve performance and decrease time spent idling. 
4. Train and coach drivers as a feasible solution to reducing the amount of time spent idling. Coaching should be ongoing, but teaching drivers to avoid idling from when they’re first hired can help establish best practices early on. Guidelines for engine idling should be part of your training program and safety culture. 
5. Fleet managers and individual operators should consider purchasing auxiliary power units (APUs) to reduce engine idle time. APUs can power trucks during rest periods without using fuel so that drivers can enjoy the comforts of their cabins, such as AC and lights, without burning fuel. 

Engine idling may seem harmless, but it actually has tremendous impacts that can negatively affect everyone. It wastes a significant amount of money on fuel and puts harmful toxins into the environment. Keep engine idling at the forefront of your mind when driving so that you can do your part to reduce it. 

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