How Much Gas Does AC Use?

Cars are usually hot during summer. And for most, they want to feel cool while driving. Turning on your ac will do the trick. But that could mean using additional gas –everyone wants to save gas. But even if you would risk it, you would like to know. How much gas does AC use?

Knowing the amount of gas your AC uses will help you decide whether to use the AC or try other options. Yes! There are many different ways to feel cool while driving during hot seasons. You can wind down or wind up with the AC off for saving gas. But does it even save gas at all?

I will answer these questions as we progress. But the truth is nobody wants to overspend cash on gas. So they look for means to avoid excess consumption of gasoline.

How Much Gas Do AC use

how much gas does ac use reddit

AC usually will consume fuel. But the amount of fuel it consumes will depend on how the compressor works, your car brand, driving habit, and many other factors. However, you will likely use about 10 to 25% of your gas driving during a hot climate.

When running your car, gas mileage with the regular AC will differ from max AC.  So which consumes more? Does max a.c consume more gas?  The max AC consumes less fuel because it only recirculates cool air using the AC fan. This is unlike the normal AC that works from scratch to cool the vehicle.

Again driving slowly with the AC on will consume more fuel than moving fast. Fast drives tend to be fuel-efficient with the AC on. In the same vain, don’t expect a Maserati and a Toyota engine to consume the same amount of gas when the ac is on. Both cars operate differently.

Driving too frequently will also cause you to use more of the air condition. More AC means more gas. But it doesn’t happen like this all the time

In cold climates, except to remove fogs from windows, many do not really use the AC; they use it mostly in hot temperatures. So this means the atmospheric condition is also a factor determining how much gas AC consumes.

As noted above, how much gas your AC uses is dependent on many factors, with the first being your car brand.

does ac burn gas in car


Q: How Much Extra Gas Does AC use

Using the AC indeed consumes gas. But how does AC affect gas mileage? With the AC on, you are likely to spend 5% per mile. This, too, depends on your car’s model and what you do when AC is on. If a driver at high speed uses about 10% of gas with the AC on, a slow driver will spend more.

This is because it uses less gas at high speeds in hot weather. But if you find out that the AC is draining the fuel faster at high speeds, turn it off. This happens mostly if the fuel in the oil tank is extremely low.

Another point to note is how often you make stops and go. Stopping and starting a car almost immediately will cause you to use more gas. This is true because when you stop a car, starting it afresh tells on the engine. The more the engine works, the more gas it consumes.

In other words, you can’t compare a driver who drives straight to his destination to another who stops almost every hour. Nevertheless, when making this estimate, the first thing to consider should be the car you’re driving.

Q: Does Running The AC Use More Gas

Running the ac uses more gas. So how does AC affect fuel consumption? An engine that’s running will usually use fuel. So when you put on the AC, the engine’s load increases. This is how it works.

The AC needs to get its power from somewhere, which obviously is the engine. This puts more stress on the engine and causes the engine to work more than required. The more the engine works, the higher fuel it consumes.

Q: How Much Gas Does AC Use While Parked?

How much gas a car AC uses when parked depends on whether the car is totally off or idle. If your car is packed with the engine on, your car’s engine is resting. 

Meaning you are using little or no fuel at that point. So if at all you want to calculate how much gas you used, it will be the one you used while driving before you parked the car.

Q: How much gas does AC use when idle?

If a car is parked, yet the engine is still on, the vehicle is idle. When your AC runs while idle, you may be using up to 10% extra gas. Say you use 15% of gas while driving with the AC on. You might be using a total of 25% together if you keep idling with the AC on.

Q: Does Not Using A.C Save Gas?

Not using AC saves gas and, at the same time, does not. Whether not using AC to save gas will depend on what you do with the car.

First, if your AC is off, you might be thinking of two possible options. Turn down or wind up the window. The first might cost you gas; the latter might not. But will cause more than just gas.

With the windows open, your car is exposed to a breeze that causes resistance. The engine, in turn, works to pull through the resistance so your car would run properly. This action stresses the engine and causes it to use more fuel than usual.

Even worse is if you are driving at a very high speed. More speed, more resistance, more work on the engine, more fuel.

If your windows are opened, the best practice is to drive slowly – you consume less fuel.

Then you may ask, what if I decide to wind up the window with the AC off? It causes your cabin to heat up. The heat could cause serious health issues or results in suffocation or drowsiness, which could lead to a crash.

Q: How Much Fuel Does A Car Use Idling With AC On

If you leave your car idle with your AC on, you will be using between 8% to 10% extra fuel.  While it is true that you consume fuel when driving with your AC on, you tend to use more fuel when idling with AC on. Even a Toyota Innova, which doesn’t consume fuel with the AC, is affected by such idling.

Q: What Uses More Fuel, AC, Or Windows down?

Both methods use fuel. And I guess you would probably think your AC consumes more fuel than the window down. To others, having windows down is a great way to have better gas mileage. But which method consumes more fuel depends on your car, driving habits, and many other factors.

In some cars, driving at high speed with AC on is fuel-efficient. But at low speeds consumes fuel. In reverse, moving with the windows down at high speeds consumes more fuel. But on low speed saves gasoline

In other words, none consume more than the other. It just depends on your car type and what you do while applying either method.

Q: How Do You Increase Fuel Efficiency A.C Use?

As you know already, there is no way you can escape consuming fuel. Whether the AC is on or windows are down, you will still use fuel. So the best way is to minimize how much fuel you consume by adopting any method.

Does AC burn gas in the car? Yes, it does, but there are ways you can make the most of it to save fuel.

  • Turn off your AC when idling. Using AC while idle consumes extra fuel.
  • Always park your car under a sunshade. This will prevent your cabin from getting exposed to the sun and getting hot.
  • If the cabin gets hot, open the windows and let out hot air before turning AC on. Using AC in hot cars causes the engine to use more fuel.  The AC will first work to eliminate the heat before working properly to cool the vehicle. The more the AC works, the more the engine works, the more gas you use.
  • Don’t use AC if there is no need.
  • Use the max AC if possible; it uses less fuel.
  • Avoid setting your AC to a lower temperature you don’t need.
  • Avoid driving too much in hot weather. You will be forced to use the AC every time you drive.
  • Refer to your owner’s manual to understand how your AC works and the best way to use them.

Does Not Using AC in Your Car Save Gas? YouTube

Final Thoughts

Driving in a cool car during a hot summer makes driving comfortable. But many still want to know how much gas is at risk here and how it tells on their pocket. So they ask, how much gas does AC use?

This question helps one decide whether to use the AC or opt for other ways to cool their car. However, whatever method you use will still use gas. Adopt the one that is good in your pocket, considering your car brand and other factors. Windows open on low speed or AC on high speeds are good options.

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Osuagwu Solomon

Osuagwu Solomon is a seasoned automotive technician for the past 9 years, and a technical writer. He loves writing about auto professional repair guides, DIY repair guides, and buyer’s guide. After spending six years in the automotive workshop, he decided to impact his knowledge to people aside his domain, and he has achieved this by centering his Automotive writing skills on REPAIRS.

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