We have factory-installed tire pressure monitors in the RAV4. I believe these are government mandated after the whole Firestone debacle.
Anyway, these things are probably useful primarily to people who can't recognize low pressure driving dynamics, and who don't check their tire pressure regularly.
But it turns out it's useful for the rest of us, too: the tire pressure monitor flagged low pressure in the Toyota's spare tire, which even I don't check regularly. That's pretty awesome.

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