They should be changed about every 30,000-50,000 miles depending on how hard the car is driven. Look at them and see how low they are.
The 2008 Scion xB has 41.3 in. of front leg room.
The 2008 Scion tC has 37.6 in. of front head room.
The 2008 Scion xD has 40.3 in. of front leg room.
The 2008 Scion tC has 53.2 in. of front hip room.
The 2008 Scion tC has 54.3 in. of front shoulder room.
The 2008 Scion xB has 55.8 in. of front shoulder room.
The 2008 Scion xD has 51.9 in. of front shoulder room.
The 2008 Scion xD has 51.1 in. of front hip room.
The 2008 Scion xB has 40.0 in. of front head room.
The 2008 Scion xD has 38.9 in. of front head room.
The 2008 Scion tC has 41.6 in. of front leg room.
The front track of the 2008 Scion tC is 4 ft. 11.3 in. (59.3 in.).