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Because the thread spreads out flat on the tarmac.
The grooves in the thread become narrower as they no longer spread out.
It also means there is not that much difference between a new tire and a worn one.
The circumference of a new tire may be bigger, but when the thread folds flat it has just the same footprint.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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