What about the age-old question of whether you can save gas by turning off your air conditioner and rolling down your windows or whether you’re better off leaving your windows up and turning on your air conditioner?
It all depends on how fast you’re going. The tipping point is 60 mph. If you’re driving 60 mph or faster, it makes sense to roll up your windows and turn on the A/C. On the other hand, if you’re driving slower than 60, you can get better gas mileage by rolling down your windows and turning off the A/C. This has to do with aerodynamic drag. The faster you drive, the more drag, so if you roll up your windows, you reduce drag.
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