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Remember the "resistance" you felt when wading thru water? That's what the tyres feel, too, only instead of pushing the water away, the tyre is squishing it away thru the sipes on the tyre...parting water from between the blocks & sipes to the sides of the tyres takes energy, which is resistance.
But, ironically, a damp day has less air-density for the car to penetrate, so air-resistance should be somewhat reduced. The worst time for speed-trials is on a COLD, DRY day, when air-density is highest.
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