1. Tires that are underinflated by 6 PSI can cause reduction in fuel economy of 3-4%.
2. Car tires lose about 1-2 pounds of air pressure per month on average (less in the summer, more in the winter).
3. Contrary to popular belief, deflating tires slightly in snowy weather does not increase traction. Instead, it increases tire wear and the probability of tire failure.
4. For every 18 degrees F ambient temperature change, a car tire's pressure changes by about 1.5 PSI.
Courtesy of Today I Found Out
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