Does keeping the car in external circulation mode consume more fuel?

[TannerLee]

Keeping the car in external circulation mode without turning on the air conditioning or fan does not consume additional fuel. Here are the relevant explanations: 1. Car air conditioning: The car air conditioning system (air-conditioning-device), referred to as car AC, is used to regulate and control the temperature, humidity, air cleanliness, and airflow inside the car cabin to optimal conditions. It provides a comfortable riding environment for passengers, reduces travel fatigue, and creates good working conditions for the driver, playing an important role in ensuring safe driving. 2. External circulation: The external circulation mode uses a fan to draw outside air into the car, meaning the air passages inside and outside the car are interconnected. The air blown by the fan comes from outside the car. Even if the fan is not turned on, airflow is still drawn into the car while driving, replenishing the cabin with fresh air.