Every light vehicle built since September 2007 is required by federal law to warn its driver about low tire pressure, and none of them is required to say where the air is going. Our new research report, Chasing Air, covers what that gap means for the tire bay that has to find it: the TREAD Act and FMVSS 138 history, the NHTSA fleet surveys on how much low pressure is still rolling around, the 2024 federal study of aging sensors and repair costs, and the diagnosis time, priced with the same formula already live on our leak calculator.
The web edition includes the full mandate timeline, an intake checklist a service desk can run starting Monday, and the print PDF for the shop office. Every figure is cited to a primary source, and where none existed we left the number out. Read it at https://chaossupplies.com/pages/slow-leak-tpms.