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I always thought the main reason for a grille block was aerodynamic. The faster heating a side benefit becoming greater in winter. I found these numbers recently. Someone posted them and I'm trying to find the original source.
sources of aero drag: from Toyota Nation Forums
Cooling package (including radiator, intercooler, oil cooler, etc) - 33.4%
Exterior - 31.7%
Front wheels - 13.1%
Rear wheels - 6.9%
Floor - 6.9%
Rear Axle - 3.1%
Engine - 3.1%
Front Suspension - 1.4%
Exhaust - 0.7%
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