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The Curious Bag
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Tires, checked monthly for correct pressure, are key to helping prevent an accident. Most people think the number on the tire itself is the correct pressure, but this is the maximum pressure allowed. Check your owner's manual for recommended ideal pressure for optimum performance.
Underinflation
Low tire pressure causes a higher rolling resistance, which means more of your tire is in contact with the road. This results in faster wear, overheating and lower fuel economy.
Overinflation
When tire pressure is too high, rolling resistance is lowered. Too much pressure causes the car to almost bounce on the road. When the tire doesn't have correct contact with the road, it doesn't maintain proper traction and control of the car can suffer.
Wasted Gas
Underinflated tires are the cause of about 5 million gallons of wasted fuel every day, according to the U.S. Department of Transportation. That adds up to more than 2 billion gallons of wasted fuel per year.
Fuel Economy
The Department of Energy says keeping your tires properly inflated can improve your car's fuel economy up to 3.3 percent.
Weather
Changing temperatures cause the pressure in your tires to fluctuate. For every 10 degrees Fahrenheit the temperature drops, your tires' air pressure will lower by about one pound per square inch.
Source:
Fueleconomy.gov: Keeping Your Car In Shape
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