TOYOTA 2011 Yaris Hatchback - Manual (Page 290)

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