Mine is fully 100% blocked if the daytime highs are below 80F. Above 80 I open 1/4 of the grille.
The more efficiently you drive, the less excess heat there is. This morning, for example, was 40 degrees here. I finished the drive 12.9 miles later with the water temperature at 182F - not quite fully warmed up.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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