Lexus RC300h 2017, Manual

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7-3. Do-it-yourself maintenance
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Effects of incorrect tire inflation pressure
Driving with incorrect tire inflation pressure may result in the following:
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Reduced fuel economy
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Reduced driving comfort and poor handling
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Reduced tire life due to wear
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Reduced safety
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Damage to the drivetrain
If a tire needs frequent inflating, have it checked by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
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Instructions for checking tire inflation pressure
When checking tire inflation pressure, observe the following:
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Check only when the tires are cold.
If your vehicle has been parked for at least 3 hours or has not been driven for more than
1.5 km or 1 mile, you will get an accurate cold tire inflation pressure reading.
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Always use a tire pressure gauge.
It is difficult to judge if a tire is properly inflated based only on its appearance.
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It is normal for the tire inflation pressure to be higher after driving as heat is generated
in the tire. Do not reduce tire inflation pressure after driving.
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Passengers and luggage weight should be placed so that the vehicle is balanced.
Tire inflation pressure
Make sure to maintain proper tire inflation pressure. Tire inflation pressure
should be checked at least once per month. However, Lexus recommends
that tire inflation pressure be checked once every two weeks. (

P. 604)