OK, the window thing. Mythbusters tested it TWICE!
Under 35mph open window is more fuel effecient. Over 40mph Airconditioning is more effecient. They tested it twice with 2 different cars in 2 different episodes.
Also, pickup trucks… PUT YOUR TAILGATE UP! They also proved that leaving your tailgate down ruins your trucks aerodynamics & lowers fuel economy. The net works, but no tailgate significantly lowers fuel economy.
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