How much fuel does a 420-horsepower engine consume per hour at idle?

[LondonLee]

420-horsepower engine consumes approximately 2 liters of fuel per hour at idle. Besides fuel consumption, idling can also cause carbon buildup in the engine, which may affect engine performance over time. Therefore, avoid idling unless necessary. Below are additional hazards of idling: 1. Carbon buildup can even lead to piston ring failure: Due to prolonged idling, the engine temperature remains too low, resulting in incomplete fuel combustion, which easily causes carbon buildup, clogging the fuel injectors. Severe carbon buildup can cause piston rings to seize or even break. 2. Increased engine wear: Prolonged idling leads to poor fuel atomization, and unburned atomized diesel can wash the cylinder walls and enter the lubricating oil, diluting and degrading the oil. This results in insufficient lubrication for engine components, accelerating wear. 3. Air quality impact: Poor combustion in engines running at idle for long periods leads to worse exhaust emissions. If toxic gases enter the cabin, they can pose life-threatening risks to occupants. 4. Fuel wastage: Low idle speed reduces the oil pump speed, leading to low oil pressure and insufficient lubrication at various points.