Myth vs Reality: Part 2

Lets say just say we start talking about the Godfather and the karate kid.   Then we talk myths versus reality with your car.  Would it be better to drive your truck with the tailgate down?  Would you save gas with your windows down?  

Lets say just say we start talking about the Godfather and the karate kid.   Then we talk myths versus reality with your car.  Would it be better to drive your truck with the tailgate down?  Would you save gas with your windows down?  
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