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I would suggest covering the upper grill opening completely, and see how that helps. The lower opening is generally much better at getting air through the radiator, since it is near the stagnant point, and close to the ground.
Also, once you limit the air flow into the cooling system, you can improve cooling by blocking off any openings in the lower "chin" area, that were needed before -- now with less air, all of it should go through the radiator. This way, just the right amount of air can do the job, and the lowest amount of drag can improve you FE by 10%+.
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