Ok, I have heard this one for a long time, but I was never satisfied with the common wisdom. So, will rolling down windows save fuel or not, when driving? It turns out the answer in not merely, AC is more efficient than windows. If you are just driving around town, rolling down the windows will not affect the drag of a vehicle sifnificantly. AC only becomes more efficient once you get above 45mph. At 55 mph, windows can increase a car's drag 20% or more. So, below 40 mph - Windows, and above 45 mph - AC.
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