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3% mpg
the grille block portion of your mod would net you a 3% mpg improvement tops.The mods you've pictured would affect other things as well.Not to sound like a know it all but,air doesn't like "wedges",they create very unstable flow acceleration and you could still experience separation where the mods integrate to the vehicle.Increasing the leading edge radii instead,would net you greater improvement.If you were looking at the nose from atop a ladder,the ideal nose would appear as a semi-circle.
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