Jim, a tire warranty is a lot different than a tire damaged in a collision. If someone whacked the side of your car and killed the tire the insurance company could rightfully demand that you participate in buying the new tire, if there is measurable wear. This can get really hairy in the case of an AWD vehicle, where all 4 tires must have very similar rolling diameters for the ABS and traction control to work properly...if one tire gets damaged, the insurance company only owes for the un-used portion of that tire, and if you have to buy a set of 4, it's your problem. They don't owe for obsolescence, which tire wear effectively is.

On the subject of glass, there's no reason salvage glass can't be used. In the case of windshields, they ALL have stone chips or other small divots, so the use of salvage windshields would be unusual. On top of that, many are glued-in and contribute to the structural integrity of the car, and cutting out a windshield can be tricky.

Jimb, I'm not trying to pick a fight with you, just pointing out what I've seen in my personal experience...make no mistake, the company is holding all of the cards...

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2002 Ford ZX2
2 x 2013 Honda Civics