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I use the vent windows feature, while parked inside our garage, primarily to rid the car of any smells, e.g., takeout food, my kids' general stink after a day of running around, or the funk that emanates from the HVAC.
Yes, nice feature to vent extra heat outside.
This was one reason why moon roofs becoame very popular,
by allowing to vent a car very quicly after been parked outside on the sun.
Note: However, I would not keep the windows cracked open in the street,
as some one will just find funny to break the window.