March 9, 2011
Will you save more fuel while going at 70+MPH with the A/C on or Windows down?
Mythbuster’s said that you will use more fuel if you run the A/C but I Just read on the Discovery site on this quiz: http://dsc.discovery.com/games-quizzes/driving-myths/
It’s the very first question but after watching Mythbuster’s I don’t get it, but they did test it at 40 MPH (I think) I really want to know this because It’s get’s hot were I live (GA)
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Filed under Gas Conservation FAQ by on Mar 9th, 2011. Comment. 
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Comments on Will you save more fuel while going at 70+MPH with the A/C on or Windows down?
At 40mph it best to roll down windows, but doing 70 on interstate it best to use the a/c cause having windows open causes drag.
Just use the AC, at 70MPH it will be more efficient than with the windows down. Even at slower speeds the AC does not affect fuel economey that much. It’s better to just be comfortable.