I'll :?: the aerodynamic (respectfully) I can not imagine the solid flat surface of the grill being more aero than the same shape with openings.....I suspect the Tsat will just open more but don't know.
I will say I have never had a car that gives heat from the heater core quicker than this one. Even in upper 20's/lower 30's I have heat by the end of my driveway/street which is about 1000' I drive slow down it in 1st gear about 15 mph just almost coasting downhill.
2012 V6 traded in for a 2017 VW GTI.