What are the economics (at least in terms of fuel efficiency) between driving with the air conditioner on and driving with “360 A/C” (i.e., with the windows rolled down)? Air conditioning draws on power, which reduces mileage. Windows open increase drag, which reduces mileage.
Not surprisingly, there’s no easy answer [1] (it varies wildly with the vehicle in question, the temp, the speed, etc.), but the simple rule of thumb seems to be that a/c is better at freeway speeds, windows at slower than that.
Now, which will keep you cooler (vs. more solvent) is another matter.
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