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Consumer Reports did a study on this and it only reduced gas mileage by 3% on a Honda.

https://shop.advanceautoparts.com/r/advice/car-maintenance/c...



At 65mph and ~85 degrees. The page I linked sources several studies testing at many other temperatures and speeds.


No car takes a 25% hit from the A/C in gas mileage.


>The internal combustion engine (ICE) variant has an estimated fuel efficiency of 14.7 mpg‑US (16.0 L/100 km), decreasing to 8.6 mpg‑US (27 L/100 km) when the air conditioning is on.




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