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You can measure the tread on your tires in as much time as it takes to get in and start your Lexus. See for yourself: Simply grab a quarter and find the grooves that go around your tire. Turn Washington upside down and insert him headfirst into a groove. If you can see the top of his head, it’s time for new tires.
Tire manufacturers have a recommended psi, which dictates an optimal pressure level for your car and its tires. However, that psi number is set for when your tires are cool.
Ideally, when you add air to your tires in the wintertime, you should fill them up when they are still cool. However, since most people don’t have a way to inflate them at home, you will probably have to drive to a gas station first.
Before you leave home, measure the tire pressure for each tire and make a note of it. When you get to the gas station, measure the tires again, then add the amount of pressure you needed based off of the first reading.
If you leave your tires underinflated, it will cause you to lose some control of steering, increase friction, cause more wear on your tires, and decrease your car’s efficiency in using gas. However, if you overinflate your tires, your ride will be bumpier.