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Siping
Caution! Pure theoretical thinking here. Heat buildup in a tire is from internal friction from the constant flexing of all the tire's components. Reducing the resistance to flexing should reduce the heat and thus the energy required to roll.
I can imagine siping reduces the resistance of the flexing of the tread. Thus a potential FE gain. However, any gain would be minimal and probably not worth it.
Siping is best for enabling water to escape the surface of the tread in wet weather and thus greater resistance to hydroplaning.
-- Teri
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