Quote:
Originally Posted by WereBo
It's to do with airflow and slipstream. It only makes a noticeable difference when you hit about 50MPH or over.
It's the same if you have a roof-rack mounted, they can add up to 40% fuel usage, especially if loaded with luggage etc. That's why you see folks covering the luggage with plastic sheeting etc. It not only keeps any rain off, it smooths the airflow somewhat.
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Actually thats a myth, having your windows open makes no real difference in gas milage unless you drive a larger SUV ( Larger SUVs Pocket more air. ) But even then it only adds an average of 5 cents a gallon to your fuel consumption budget. ^_^
* Watched way too much Mythbusters back in the day *