With TPMS it is not recommended to use the tire repair gunk. What a mess!! Why would Toyota include a can in the PIP? Marketing the loss of spare tire to artificially make the buyer feel better? What is the (actual life) of the batteries in the TPMS sensors? 5-7 years? I know the techs can measure battery charge remaining, but wondered what real life scenarios there were for replacing the sensors when changing tires.