Self-Inflating Tires
A tire that uses flexing while rolling to keep pressure constant.
http://www.popularmechanics.com/technology/engineering/news/10-world-cha...
Not sure how the 'optimum' pressure is set, but this would compensate for load, temperature, and slow leaks. Not sure how well it would deal with no-so-slow leaks!
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"What we found is that temperatures increased in the last hundred years as much as they had cooled in the last six or seven thousand," he said. "In other...