I think you asked this question b4 and i answered you

来源: 于 2009-03-03 13:12:52 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

your tire is leaking, go patch it.
keep in mind - every 10 F change will result in a pressure change of 1.5 psi.