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Great idea!
That got me to thinking; what about a grill block like you describe, but something flexible so that it bends to the contour of the grill opening and blocks it while driving, but when slow or stopped, it stands out to allow more air flow?
It would be tough to get just the right amount of flex so that the fan turning on doesn't draw the block closed, but you would want it to close up on the freeway.
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