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It may not be the grill block its self but where you blocked the grill.
I blocked the passenger side of my upper grill. What I got was cooling problems and I looking at it and said WTF. I only blocked 25% of the total area for air intake. So I changed it to the upper half of the grill still only 25% block and the cooling problem was corrected. Also although I'm not positive but pretty confident that blocking the upper half did improve my fuel mileage over the side block.
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