Subaru 2003 Legacy Owner's Manual page 413

D Correct tire pressure (tread worn evenly)
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)
Rolling resistance is high, so fuel consumption is also higher.
Maintenance and service
HGB033AA
HSB012AA
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