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While I understand every little bit helps, there are bigger issues in the ice and snow.
I know with my old car that had snow tires on steel wheels, the big issue was not with the wheels, but with the ice and snow accumulation. When it sticks to everything, it adds a tremendous of weight as well as makes the car less aerodynamic. Plus, the added weight of the snow on the wheels themselves puts more load on the engine when accelerating and staying at a given speed.
My take is to put the wheel covers on. When it snows or when there is snow on the road, take them off.
It would take some testing to see what the real difference is.
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