Keeping your tires properly inflated is a very good idea. An under-inflated radial can increase wear while also decreasing performance and fuel economy. But if the state of California can help it, under-inflated tires may soon be a thing of the past.
Imagine you're on vacation. You rent a car for your month-long stay in Mexico. You feel pretty comfortable passing on the optional insurance and go along on your merry way. All goes well until one stormy evening. Somewhere in the night you have a blowout. You phone it in and the people at Hertz tell you, "No problem, just bring it back and we'll replace the tire." Done. Report filed, agent tells you no worries again, there won't be any charges.