Which consumes more fuel, recirculation or fresh air mode?

[VanMason]

If the car's air conditioning is on, the recirculation mode is slightly more fuel-efficient than the fresh air mode, though the difference in actual usage is negligible. The fresh air mode consumes approximately 0.1 liters more fuel per 100 kilometers compared to recirculation mode – a marginal difference that can be disregarded. Below is more information about recirculation and fresh air modes: 1. Fresh Air Mode: This mode draws air from outside the vehicle, directs it through the air conditioning system for heating or cooling, and then blows it out through the vents. It replenishes fresh air and improves cabin air quality. However, in extremely hot and dry weather, the air conditioning compressor must continuously work to cool the incoming hot air, consuming additional fuel. 2. Recirculation Mode: This mode circulates the existing cabin air. The air conditioning system draws in cabin air, cools it, and recirculates it back into the cabin. Once the cabin temperature reaches the set value, the compressor disengages, reducing engine load. Therefore, the faster the cabin temperature reaches the set value, the sooner the engine load decreases, resulting in lower fuel consumption.