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Yeah, I believe most tire alarms are psi-based. In fact, I "think" I read that the newest Generation 4 Mazda3s have gone to that system, which is probably the more popular system.
I like my Generation 3's system because it works quite effectively in reporting low tire pressure and, as in my example above, even some tread faults. Another advantage is that since it incorporates no tire pressure device on each tire, there's nothing to change out when new tires are installed.
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