City & Business Personal Finance Home Finance Personal Finance Taboola above the article placeholder Drivers were told to “stay away from this button” because it makes the car use 20% more gas. Drivers may be using up to 20% more gas than they need to.
Add to Google as a favorite source Add us as a favorite source. 1 By Felix Reeves and Jane Lavender, 07:00 on Sun, Apr 5, 2026; Updated: 08:43 on Tue, Apr 7, 2026 Drivers were told to stay away from one button because it “increases fuel consumption by 20 percent.”
Drivers were told to stay away from one button because it “increases fuel consumption by 20 percent.” With the weather finally warming up and gas prices staying high, a lot of drivers will be looking for ways to stay comfortable while getting better gas mileage.
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When it’s warm outside, drivers usually have to choose between rolling down the windows or turning on the air conditioning.
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Many people may not realize how much they affect fuel efficiency, but both options have a big effect on how people use fuel.
Air conditioning uses a lot of energy, and opening the windows can make the car drag more, which makes it work harder and use more gas.
Both options are possible, but there are times when one is better for the driver and the vehicle.
Chris Evans, the head of content at Leasing.com, talked about the benefits of using both air conditioning and opening the windows.
When you use the air conditioning, your car’s fuel economy can drop by 10%.
Using the air conditioning can make your car use 10% more gas. He talked about a 2004 study by the Society of Automotive Engineers (SAE) that looked at how opening windows instead of using air conditioning affected larger sedans and SUVs.
There were a lot of different factors in the study, such as how open the windows were, how well different cars moved through the air, and how long the air conditioning was on.
He said that the 45mph number is a guide, but a pretty good one. “This may seem like a small issue, but getting it wrong can have a big effect on your fuel economy.”Using air conditioning can make your car use up to 10% more gas, but opening the windows at higher speeds can make it use up to 20% more gas.
“While the 45mph line is a good guide,” Mr. Evans said, “things get a bit more complicated when you are in bumper-to-bumper traffic.”In these cases, it’s probably best not to use the air conditioning or open the windows.
“But we know that this might be uncomfortable in hot weather, so you could turn on the air conditioning and close the air vents.”The air conditioner doesn’t bring in air from outside; it just recycles the air in the cabin. There is a line of cars outside that are all belching out exhaust fumes.
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