Sylvie Willis
Allowing your car engine to idle can have a significant impact on fuel consumption, the environment, and your wallet. While idling, a car's engine burns between 0.16 and 0.7 gallons of fuel per hour, depending on the vehicle's size and engine displacement. This can add up quickly, costing owners time and money, and contributing to increased carbon emissions. Restarting a petrol or diesel engine uses less fuel than idling for more than 10 seconds, so it is recommended to switch off the engine if you expect to be stationary for longer than that.
| Characteristics | Values |
|---|---|
| Fuel consumption | A large, old engine can use 2.0 litres of fuel per hour of idling. Smaller, more efficient engines burn slightly less than 1.0 litre per hour. |
| Engine restart vs idling | Restarting a petrol or diesel engine uses less fuel than idling for 10 seconds. |
| Environmental impact | Every gallon of gasoline burned emits about 20 pounds of carbon dioxide into the atmosphere. |
| Financial impact | Idling vehicles waste nearly 6 billion gallons of fuel per year, costing owners more than $20 billion. |
| Engine wear | Idling does not actively harm the engine but can put strain on certain components and increase wear over time. |
| Bore glazing | Extended periods of idling can lead to bore glazing, a condition where the cylinder walls develop a glassy coating, reducing sealing effectiveness. |
| Spark plug efficiency | Incomplete fuel combustion during idling can reduce the efficiency of spark plugs in petrol engines, increasing fuel consumption by 4-5%. |
| Engine temperature | Idling can help keep the engine temperature stable, reducing metal-on-metal wear during start-up. |
| Air conditioning | Engaging the AC while idling puts additional load on the engine, increasing fuel consumption and engine wear. |
| Legal considerations | In some places, it is illegal to leave an unattended vehicle idling, as it poses a security risk. |
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What You'll Learn
How much fuel does idling waste?
Allowing your car to idle can waste a lot of fuel and cost you a lot of money. Idling for 20 minutes a day for a year can waste nearly one full tank of gas. This can cost you more than you might think, and it also has serious environmental consequences.
The amount of fuel a vehicle consumes while idling varies depending on factors such as its weight, engine size, and the type of fuel it takes. Generally, an idling car uses somewhere between 1/5 to 1/7 gallon of fuel per hour. Compact cars that carry a 2-liter capacity engine burn around 0.16–0.3 gallons of gas on a per-hourly basis. A large sedan, on the other hand, with a 4.6-liter engine, burns approximately 0.5–0.7 gallons of gas while idling.
In 2020, a study by Transport Energy Emission Research found that Australian passenger vehicles idle for about 20% of the time they are running, so this extra fuel consumption could eventually add up at the pump. Idling vehicles can use more gas than you might realize, and this directly affects how much you spend on gas and how often you need to refuel.
Excessive idling has a negative effect on the engine and exhaust system and increases maintenance costs. Extended idle operation may lead to reduced efficiency of engine lubricants, engine or spark plug wear, and accumulation of fuel residue in the exhaust system. It can also cause a buildup of carbon residue in a truck’s engine.
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Idling and its impact on the environment
Idling wastes fuel and has a detrimental impact on the environment. An idling car burns between a fifth and seven-tenths of a gallon of fuel per hour, while an idling diesel truck can burn approximately one gallon of fuel per hour. This not only wastes fuel but also contributes to air pollution and increases carbon emissions.
Idling engines produce the same pollutants as moving cars, including carbon dioxide, carbon monoxide, and other toxic gases and particulates. These emissions have been linked to serious human illnesses, including asthma, heart disease, chronic bronchitis, and cancer. Additionally, idling increases carbon emissions, which contribute to global warming. For every 10 minutes an engine idles, it releases one pound of carbon dioxide into the atmosphere. In New York City alone, idling cars and trucks produce 130,000 tons of carbon dioxide annually.
Furthermore, idling can cause a build-up of carbon and other deposits within the engine, as its components are not designed to work as efficiently at idle speeds. This can lead to increased fuel consumption and reduced engine performance over time.
To reduce the environmental impact of idling, it is recommended to turn off the engine if you expect to be stationary for more than 10 seconds. This simple action can help improve air quality, reduce carbon emissions, and even save money on fuel costs.
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Idling and engine wear and tear
Idling refers to running a vehicle's engine when the vehicle is not in motion. Idling can have several negative effects on a car's engine, including increased wear and tear, reduced performance, and increased fuel consumption.
When a car is idling, the engine is still running and all its components are in motion, subjecting the engine to constant stress and wear. This can lead to premature engine failure and costly repairs. Frequent idling can cause specific components, such as pistons, bearings, and cylinders, to wear out prematurely. Additionally, idling can cause a buildup of soot and other harmful emissions in the exhaust system, leading to clogged filters and increased maintenance costs.
However, some modern computer-controlled engines do not appear to be harmed by idling. For example, diesel engines tolerate idling better than gasoline engines due to their unthrottled nature and higher airflow during idle. Nevertheless, it is generally recommended to keep idling time to a minimum to prevent unnecessary wear and tear on the engine.
The impact of idling on engine wear and tear is also evident in the used car market. When purchasing a used car, it is essential to consider not only the mileage but also the idle hours, as these hours contribute to the overall wear and tear of the engine.
In summary, while idling may be necessary in certain situations, such as during cold winters, it is advisable to minimize idling time as much as possible to maintain engine health and avoid premature wear and tear.
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Idling and health
Idling your car for more than 10 seconds uses more fuel than turning off the engine and restarting it. The average person idles their car for five to ten minutes a day, and a car idling for two minutes uses about the same amount of fuel it takes to drive one mile. Idling also puts a strain on the engine, causing wear and tear on the cylinders, belts, and spark plugs.
However, the primary concern with idling is the negative impact it has on the environment and, subsequently, human health. Idling wastes fuel and increases emissions of carbon, toxic gases, and fine particulates that reduce air quality. Motor vehicles emit numerous pollutants, including carbon monoxide, nitrogen dioxide, and volatile organic compounds, which can lead to the formation of ozone—a major problem in some regions during the summer months. The World Health Organization estimates that air pollution is responsible for 4.2 million deaths each year.
To reduce the amount of time spent idling, it is recommended to turn off your engine if you plan to idle for longer than 10 seconds. This simple habit can help improve fuel economy and reduce emissions, thereby positively impacting the environment and human health.
In some places, it is illegal to leave an unattended vehicle idling. This is not only for security reasons (an unattended idling car is an invitation to theft) but also to reduce the environmental and health impact of unnecessary idling.
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How to reduce idling
Keeping your car idling does use a lot of fuel and can be harmful to your engine. Idling for just 20 minutes a day can waste almost one full tank of gas over a year. It also has serious environmental consequences, emitting about 20 pounds of carbon dioxide into the atmosphere per gallon of gasoline burned.
- Turn off your engine when stopped: If you expect to be stationary for longer than 10 seconds, you will save fuel by switching off your engine. Restarting a petrol or diesel engine uses less fuel than idling for 10 seconds.
- Use a fleet management system: A fleet management system can provide real-time information about your vehicles, including how long they idle. This can help you make more specific policies and train crews to drive more efficiently.
- Optimise delivery routes: If you handle large fleets, such as in the logistics industry, optimising delivery routes can help to reduce idling time and save money.
- Use a fuel management system: Solutions like real-time monitoring and fuel management systems can help you reduce fuel waste and spending.
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Frequently asked questions
Yes, idling uses fuel. The amount of fuel used depends on the car, but a large, old engine can use as much as 2.0 litres of fuel per hour of idling. Even the smallest and most efficient engines burn a little less than 1.0 litre per hour.
Idling does put a small amount of strain on the engine, and engaging the AC will put the engine under load, working the engine harder. However, some sources claim that idling is not actively bad for the engine and is better than starting and stopping the car constantly.
Yes, idling has serious environmental consequences. Every gallon of gasoline burned emits about 20 pounds of carbon dioxide into the atmosphere. Idling also increases emissions of carbon, toxic gases and particulates that reduce air quality and can be harmful to health.
If you expect to be stationary for longer than 10 seconds, it is recommended that you turn off your engine. You can also install a fleet management system, which can provide real-time information about your vehicle's idling and help you train your crew to drive more efficiently.
