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Old 11-05-2012, 11:35 AM   #5
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Join Date: Oct 2012
Fan#: 105414
Location: Olympia, WA
What I Drive: '05 Silver ST

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+1 on using the pump method.

Use a log book to also make notes on driving speeds and conditions. To gain the most accuracy, use the exact same pump as much as possible, though "calibrated" they still vary.

Also check basics like tire pressure (goes down in cooler fall weather) and tire wear pattern in case of a bump causing alignment issues.

Please report back your findings.
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