How much fuel does a car consume when idling for one hour?

[OLilliana]

Based on the current average vehicle displacement of 1.5-1.8 liters, the fuel consumption during idling is approximately 1-2 liters per hour. Here are the relevant details: 1. Idle speed is related to displacement: Generally, gasoline vehicles idle at around 800 RPM, while diesel vehicles idle at around 500 RPM. The higher the vehicle's displacement, the more fuel it consumes per hour during idling. Therefore, when waiting for someone for a long time, it's better to turn off the engine rather than let it idle for extended periods. 2. Hazards of idling: Prolonged idling not only increases fuel consumption but also leads to incomplete fuel combustion, resulting in carbon deposits. 3. Auto start-stop feature: For owners who are particularly concerned about fuel consumption, choosing a vehicle equipped with an auto start-stop function is advisable. Many modern vehicles now come with this feature. 4. Function of auto start-stop: At traffic lights, the vehicle can automatically shut off the engine to save fuel. However, during engine shutdown, the air conditioning system's cooling function stops and switches to fan mode. To restart the engine, simply press the accelerator lightly, and the engine will automatically ignite. In stop-and-go city driving, the auto start-stop feature can save a significant amount of fuel.

[VonLily]

I've been driving for many years, and the fuel consumption of a car idling for an hour depends on the model and engine size. My small car has a 1.6-liter engine, and when idling at around 700 RPM, it burns about 1 liter of fuel per hour. Last winter, I waited for someone by the roadside for 40 minutes, and the fuel gauge dropped nearly 0.7 liters, equivalent to wasting 7 yuan. When idling, the engine runs without load, leading to incomplete fuel combustion and carbon buildup. Over time, this can clog the fuel injectors, resulting in costly repairs. I believe avoiding idling is important, especially when waiting at traffic lights or parked—turning off the engine is better. After the fuel price hike, I tried reducing idling by 20 hours in a month and saved 150 yuan on fuel. Additionally, some urban areas prohibit prolonged idling due to pollution, and getting fined isn’t worth it. Overall, it’s best to limit idling to under 10 minutes—saving fuel and being eco-friendly.

[McAdriel]

As a cost-conscious office worker, I'm particularly sensitive to fuel consumption. Idling for one hour consumes approximately 0.8 to 1.5 liters of fuel, depending on your vehicle's engine displacement. My 2.0L SUV consumes 1.2 liters per hour when idling. At a fuel price of 7.5 yuan per liter, that's 9 yuan wasted every hour. Over a year, if I idle twice weekly while waiting for colleagues, it adds nearly 500 yuan in extra fuel costs. When idling with AC on during summer, fuel consumption doubles - I've measured it at 2 liters, burning through 15 yuan directly. Some money-saving tips online include downloading map apps to plan parking spots to avoid idling in traffic, or purchasing a vehicle with auto start-stop function. With current high fuel prices, I've developed the habit of turning off the engine at traffic lights lasting over 30 seconds - instant savings. Reducing idling also lowers emissions, making it environmentally friendly - a win-win situation that's definitely worthwhile.

[ElleAnn]

I prioritize eco-friendliness when driving, and idling for an hour consumes fuel that deeply concerns me. Small-displacement cars burn about 0.5 liters per hour, while larger vehicles can reach 1.5 liters, emitting several kilograms of CO2 after combustion, polluting the air and worsening climate change. I often see drivers idling by the roadside chatting, wasting fuel for hours while generating noise and exhaust. The decline in urban air quality is partly blamed on this. I support establishing no-idling zones or promoting start-stop systems to save fuel. Starting with myself, I turn off the engine when parked for extended waits, reducing my carbon footprint to protect our home. Simple actions can make a big environmental difference—let’s not underestimate this fuel waste.

[LeTimothy]

With over 20 years of driving experience, I can say that idling for an hour consumes fuel that may seem insignificant but adds up. Typically, compact cars use around 0.8 liters, while my older vehicle consumes nearly 1.2 liters when idling. However, the real damage is to the engine. Incomplete combustion during idling easily leads to carbon deposits, which can clog fuel lines and cause malfunctions—a friend of mine faced repair bills over a thousand due to this. I recommend limiting warm-up time to no more than five minutes to avoid both fuel waste and mechanical harm. After prolonged idling, always check the battery and oil pressure. Regular maintenance can prevent future issues. With current high fuel prices, saving fuel means saving money. I’ve made it a habit to schedule trips carefully to avoid unnecessary roadside idling.