How much fuel does idling with AC on consume?

[DeBrayden]

Idling with AC on consumes a significant amount of fuel. Specific example: A 1.6L naturally aspirated engine model consumes about 0.6 liters of fuel per hour when idling. If you turn on the AC, fuel consumption increases to approximately 1.1 liters per hour. This means a 1.6L naturally aspirated engine model consumes around 1.1 liters of fuel per hour when idling with AC on. Larger displacement models have even higher idling fuel consumption, and turning on the AC increases fuel consumption more noticeably. For example, a 2.0L engine consumes about 0.9 liters of fuel per hour when idling, and this increases to approximately 1.4 liters per hour when the AC is turned on. Reasons for high fuel consumption: This is because when the vehicle is idling, the engine, transmission, and other systems still need to maintain normal operation, which requires fuel consumption. However, during this process, only the AC compressor is doing work, and the energy generated by other related operations is wasted.