How much fuel does a 1.6L engine consume when idling with AC on for one hour?

[VonHannah]

Fuel consumption when idling with the AC on varies depending on the engine displacement, typically ranging from 1.4 to 2.5 liters, with an average of around 1.6 liters. While the fuel consumption is not excessive, it is detrimental to the engine, as it can lead to carbon buildup and overheating damage to the catalytic converter. Below is an introduction to idling conditions: 1. Normal idle: When the vehicle is parked and the engine is started, the minimum stable engine speed is referred to as parking idle (the process of the engine transitioning from a cold idle state to an idle state at normal operating temperature is called warming up or heating up the engine). 2. Driving idle: When the car is in gear without pressing the accelerator pedal or when the accelerator pedal is released while driving, maintaining the minimum throttle opening, the engine speed matches the parking idle speed, which is referred to as driving idle. 3. Unstable idle: Unstable idle is one of the most common issues encountered in engine maintenance. Incorrect diagnostic approaches can prolong repair times, reduce efficiency, and even cause vehicle owners to switch to another repair shop due to impatience.