Quote:
Originally Posted by MickF
... I'm pretty sure that that (generally) running aircon in a car is more efficient than driving with the windows down.
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Edmunds did some tests and the windows down, ac off was slightly better.
"The Mustang got 4.1 percent better mileage -- 30.7 mpg vs. 29.5 mpg -- with the windows down. The Land Rover got 1.6 percent better mileage with the windows down."