How much fuel does a Jetta consume with the air conditioning on?

[ReaganMarie]

The Jetta consumes approximately 8 liters per 100 kilometers when the air conditioning is on. Reasons for air conditioning fuel consumption: The higher the air conditioning setting, the greater the fuel consumption. The reason is quite simple: within a unit of time, the higher the air conditioning setting, the more cold air is produced, and the better the cooling effect. This results in the air conditioning compressor working at a faster frequency, which consumes more fuel. This is explained by the law of energy conservation. Additionally, car heating primarily relies on the temperature of the antifreeze in the radiator. In theory, this does not consume fuel, as it uses the water temperature. However, in reality, all electrical devices in the car consume fuel, albeit in small amounts. Constant-speed fuel consumption: Constant-speed fuel consumption refers to the fuel economy indicator when a car is driving at a constant speed on a good road surface. Since constant-speed driving is a basic operating condition for cars on highways, and this type of fuel consumption is easy to measure, it is widely adopted. For example, France and Germany use the constant-speed fuel consumption at 90Km/h and 120Km/h as the main evaluation indicators for fuel economy.

[JustinDella]

I've been driving a Jetta for several years, and the fuel consumption does increase significantly when using the air conditioning in summer. Normally, the combined fuel consumption in the city without air conditioning is around 7 liters per 100 kilometers, but it jumps to 8.5 to 9 liters when the air conditioning is on. This is mainly because the air conditioning compressor requires additional power from the engine, effectively increasing the car's load. I've recorded data myself, and the impact is even greater in congested urban areas due to frequent stops and starts, as the engine has to provide extra power for the air conditioning. On highways, the difference with air conditioning is smaller, maybe only an additional 0.5 to 1 liter. I recommend ventilating the car for a few minutes before departure or setting it to recirculation mode to reduce energy consumption. In summary, if the Jetta has a 1.5L or 1.6L engine, expect fuel consumption to be in the 8-9 liters range with air conditioning on, depending on the model year and driving habits. Remember, setting the air conditioning temperature too low will consume more fuel, so a comfortable temperature is best.

[SanJade]

I've been commuting with my Jetta for over ten years, and the fuel consumption usually stays at 6.5 liters per 100 kilometers in the city without using the air conditioning. When the air conditioning is on, it increases to around 7.8 liters. Based on my experience, using the air conditioning can increase fuel consumption by 10-15%, mainly because the compressor raises the engine load when it's running. Factors influencing this include the air conditioning's fan speed and temperature settings, with consumption reaching just over 8 liters on the hottest summer days. I recommend maintaining a steady speed, avoiding sudden acceleration, and regularly checking the air conditioning system for leaks, which can also help control fuel consumption. For daily use, try to turn on the air conditioning after the car has started moving, and turning it off during the warm-up phase can save some fuel. For the Jetta, city fuel consumption with the air conditioning on generally ranges between 7.5 to 8.5 liters per 100 kilometers.

[McNathan]

I think the impact of air conditioning on fuel consumption comes from the additional load on the engine. When the air conditioning compressor is working, the engine has to output more power, thus burning more fuel. For an ordinary Jetta, the fuel consumption without air conditioning is about 7 liters, but with air conditioning, it may increase by 1-1.5 liters, reaching over 8 liters. This depends on the duration of air conditioning use and driving conditions, such as being more noticeable in city traffic jams. It is recommended to adjust the air conditioning mode to medium airflow and use the recirculation mode to cool down quickly and save energy.