I like to extract the last possible mile outta tires. What good eco-minded person wouldn't? I don't consider blowouts and having to change tires that big an inconvenience- it takes only minutes. When I run "iffy" tires I make sure to have a good spare and tools on board. Even so, blowouts/flats are pretty rare; it's not like a daily occurance or anything.
The only exception I make is for the front of motorcycles (iffy rear tires OK).
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