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Window Air or Air Conditioning?

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Best two choices are

1- Fresh Air thru the vents with your windows closed (closed windows better aerodynamics
2- Air Conditioning with your windows closed - same reason as above

How do you decide? based on your comfort level. If fresh air is OK - lowest energy use.

Tesla clubs could run some actual road tests? Is the difference even measurable by mere owners?

Open windows are fine/great when aero doesn't matter ~< 50 kph - like when site seeing in parks.