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lets say a car weight 2000 pounds, and weight is evenly distributed between all 4 tires.
so, 500 pounds a tire. lets say your tires are inflated to 50 psi.
that means there are 10 square inches on the ground.
now lets say we spin the tires really frigging fast (like say at bonneville speedweek at 200 plus mph).
the centrifical force actually causes the tires to "stretch" and become round. Yes, you will actually have less surface on the ground, and you easily reach a point where the tire can be come uninflated and you don't crash until you slow down (not recommended).
all neat stuff, but all kind of insignificant for purposes of drag. you STILL have 500 pounds of force pushing down on the tire, and like serial said, it is the coefficient of drag times the normal force, and neither of those has changed significantly.
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