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Coasting?
Coasting downhill is illegal. (It's an antiquated law based on inherent limits of 1920s automobile technology.) That said, many people choose to coast downhill in neutral to improve gas mileage, and it does work. However, it's important to know that your car behaves somewhat differently out of gear; braking is slightly more difficult when engine compression is no longer keeping your speed in check. So implement at your own risk.
Slow Down
Seems like stating the obvious, but we don't always realize how fast we're going, especially when the brain is on auto-pilot. Traveling at or below the speed limit will measurably improve gas mileage. Over 60 mph, for every 5 mph you reduce your speed, you will save 20 cents a gallon in gas.
Gentle Acceleration
After a stop, don't punch your car forward. Gentle, slow acceleration is another great way to improve your mileage.
Red Lights
If you know you're coming up to a traffic light, try to ascertain your chances of having to stop. If they seem high, take your foot off the gas then - long before you actually need to brake for the possible red light.
Air Conditioning
If you must use air conditioning (a gas guzzling feature of any vehicle), turn it on when you're traveling downhill, or are stopped. Make sure to turn it off before accelerating.
Aerodynamics
Anything attached to the car can create a drag - keep your car aerodynamic by removing luggage compartments, roof racks, and needless protruding decoration.
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