Subaru 2003 Legacy - Manual (Page 413)

11
Maintenance and service
11-41
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D
Correct tire pressure (tread worn evenly)
HGB033AA
Roadholding is good, and steering is responsive. Rolling resistance is
low, so fuel consumption is also lower.
D
Abnormally low tire pressure (tread worn at shoulders)
HSB012AA
Rolling resistance is high, so fuel consumption is also higher.