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The upper and lower grilles both open into the same space that feeds the radiator and AC condenser. By blocking one or the other, you're limiting the maximum possible airflow. However, with a small and efficient engine, there's not that much cooling needed. Half the lower grille is the most I've needed in 100+ degree Texas summers, with the Scangauge reporting a maximum 206F coolant temperature. The radiator itself only spans half the width.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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