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5) Tread rubber chemistry results in a 3 way technology triangle: Treadwear / Traction / Rolling Resistance. Put another wasy: To improve one, you have to sacrifice on of the others (or both).
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Not according to a joint Federal and Californian study on tire rolling resistance. It states they are related, and altering one will generally effect the others, but that it is possible to improve all 3 with out sacrifice. Some tires are better than other tires in all three categories that you mention.