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When driving over 40 mph, you can increase your gas mileage by:
a. Turning off your air conditioningB. Closing your windowsC. Opening your air vents?

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MissPhiladelphia
When driving at speed of over 40 mph, one can increase the gas mileage by simply closing the car's windows. This is because at high speeds, open windows tend to reduce the car's aerodynamics which then leads to a significantly lower gas mileage.   
hardysouthern

Answer:

B. Closing your windows

Explanation:

Since your car becomes much less  aerodynamic if you have open windows when you're speeding over 40 miles per hour, you most likely should close your windows and, if you want, turn on your AC. If you're not going faster than 40 mph, though, open windows and no AC are the best way to increase your gas mileage.

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