Lexus GS 450h 2008 Owner's Manual page 449

Effects of incorrect tire inflation pressure
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Driving with incorrect tire inflation pressure may result in the following:
Reduced fuel efficiency
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Reduced driving comfort and tire life
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Reduced safety
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Damage to the drive train
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If a tire needs frequent refilling, have it checked by your Lexus dealer.
Instructions for checking tire inflation pressure
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When checking tire inflation pressure, observe the following:
Check only when the tires are cold.
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If your vehicle has been parked for at least 3 hours and has not been driven for
more than 1 mile or 1.5 km, you will get an accurate cold tire inflation pressure
reading.
Always use a tire pressure gauge.
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The appearance of the tire can be misleading. In addition, tire inflation pressures
that are even just a few pounds off can degrade ride and handling.
Do not bleed or reduce tire inflation pressure after driving. It is normal for the
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tire inflation pressure to be higher after driving.
Never exceed the vehicle capacity weight.
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Passengers and luggage weight should be placed so that the vehicle is bal-
anced.
4-3. Do-it-yourself maintenance
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