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That grille block looks sound, but as the other poster mentioned, you should probably block the entire upper section. No matter what, it certainly does not look like it's increasing drag.
Is there more grille below the bumper, too? If so, block 100% of the upper and a portion of the lower.
I regularly see +/-10% variations in my fuel log for no reason that is immediately apparent. If you do coast-down testing including taking a video of your speedometer, you may be able to discern the effect of the grille block.
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