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3. When old man winter coats your car with snow and ice, try to remove as much of is as you can, don't just clear a hole in the windshield.
Snow and ice add significant weight to your car, they also increase aerodynamic drag dramatically... which burns even more gas. As a side benefit, clean clear windows improve your ability to see, which improves your margin of safety in dangerous winter driving.

4. Remove bicycle or ski racks in between trips.
It's not really the extra weight that hurts your gas mileage; it's mostly aerodynamic drag.

5. Don't fly flags on your car.
And don't fly flags outside your car's windows. Yep, your guess is correct – it's aerodynamic drag we are talking about here... and your gas bill.
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