Beginning in 2007, all vehicles may be equipped with warning lights to alert drivers that any of their tires are underinflated by 25 percent or more. There has been some debate over the validity of that percentage measurement, as some tire manufacturers feel that a tire is still capable of safely operating at 25 percent underinflation. Due to possible compatibility issues, the government would only require that the monitoring system work at the time of vehicle sale, and not after tire replacement. The systems could run as much as $70 per vehicle, totaling $1.1 billion annually, but the NHTSA estimates that the mandate would save $1.7 billion overall in fuel and maintenance costs.

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