The Reality Reports

How Air Conditioning Affects Fuel Use: Yes, using your car’s air conditioner does use more fuel. The air conditioning system puts extra work on the engine, which means the engine must burn more gasoline to keep the car cool. In most vehicles, the air conditioner is powered by a compressor connected to the engine. Once the A/C is turned on, the compressor starts working and increases the engine’s workload. The amount of extra fuel used depends on several things, including the outside temperature, your driving speed, the size of your vehicle, and how powerful the air conditioning system is. On very hot days, the engine may use noticeably more fuel because the A/C system has to work harder to cool the cabin. Studies have shown that fuel economy can drop by about 5% to 20% while using air conditioning. Smaller cars may notice the effect more because they usually have smaller engines.