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As for tire grip; the sideways grip seems to improve with high pressure due to less deformation. High tire pressure may help avoid danger, even if braking distance suffers (which I doubt, actually).
One thing that goes beyond doubt is that both braking and handling improve when you get top tier tires.
All cars and bikes I bought secondhand had cheap tires on them, all of them improved dramatically when fitted with the right stuff.
I air up my tires (moderately, even) with a clear conscience.
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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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