Yes , the grill block is for aero reasons.
Not too practical in very hot summer conditions when you need a lot of cooling , but in cooler months and winter it can be used to pick up a few MPG.
But beware that if you must do heavy city driving even in winter that your temps may still rise too high with a full grill block. , so a partial block would be better suited.
Its all expermentation to see whats a good compromise for your car and your driving.
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