Important point to remember, I think, is that both systems detect a change in tire pressure. It's not telling you "good" or "bad" necessarily. It's telling you "close to before" or "so much less than before that it could be dangerous". So, setting your tire pressure properly from the beginning and initializing the system (at least for dTPMS) is important for the system to be meaningful. If you initialize the system when your tire pressure is inappropriately low, you won't get a warning from dTPMS.
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