The increased drag from having the windows open typically outweighs the impact that the a/c has on fuel economy.
And in winter its a good idea as it prevents the windows from misting, so you can see out properly and don't die/kill anyone.
@danb started
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The increased drag from having the windows open typically outweighs the impact that the a/c has on fuel economy.
And in winter its a good idea as it prevents the windows from misting, so you can see out properly and don't die/kill anyone.