TOYOTA 2011 Sienna - Manual (Page 696)

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4-3. Do-it-yourself maintenance
■ Tire inflation pressure check interval
You should check tire inflation pressure every two weeks, or at least
once a month.
Do not forget to check the spare.
■ Effects of incorrect tire inflation pressure
Driving with incorrect tire inflation pressure may result in the following:
● Reduced fuel efficiency
● Reduced driving comfort and tire life
● Reduced safety
● Damage to the drive train
If a tire needs frequent refilling, have it checked by your Toyota dealer.
■ Instructions for checking tire inflation pressure
When checking tire inflation pressure, observe the following:
● 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 mile or 1.5 km, you will get an accurate cold
tire inflation pressure reading.
● Always use a tire pressure gauge.
The appearance of the tire can be misleading. In addition, tire infla-
tion pressure that is even just a few pounds off can affect ride quality
and handling.
● Do not reduce tire inflation pressure after driving. It is normal for tire
inflation pressure to be higher after driving.
● Never exceed the vehicle capacity weight.
Passengers and luggage weight should be placed so that the vehicle
is balanced.