Fuel-Economy Face-Off: Driving With Windows Open or With A/C Running?
Consumer Reports has no relationship with any advertisers on this website. Q. Does a car use more gasoline when you drive with the windows rolled down or the air conditioning turned on? This is a question that has lost plenty of people a bet. “We’ve tested this at various temperatures with multiple vehicles,” says Jake Fisher, CR’s director of auto testing. “We found that on an 85-degree day, running the A/C can reduce fuel economy by 1 to 4 mpg, depending on the car. But air conditioning dehumidifies the car’s interior, which can help keep ...
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