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My guess is the more direct method by using sensors that measure the pressure rather than using a passive system based on tire rotational speed is more due to the fiasco with Ford Explorers and other SUV's in rollover accidents due to low tire pressure. US probably felt that the passive system was not good enough. I'm glad to have a more active system, regardless. If all of your tires are running low, the passive system won't detect that. Rare? Yes. But seasonal changes can be major and create that condition.
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Joe Morris
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