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All the discussion sounds good and theoretically sound. I'll throw in some numbers. On my daily commute, over the same 11.2 miles, different days, both starting at 57 degrees F.
No grille block, final water temperature 154F, for a rise of 97 degrees
Full grille block, final water temperature 195F, for a rise of 135 degrees
Similar results for other temperatures, but I picked 2 that were most comparable.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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