Only blocked off a small portion of the grill, but half the oil cooler in the hopes that my oil gets hotter and thinner. Looking at some charts, it seems like 10W-60 at 120C is more like a 40 weight at 100C, with 60% of the viscosity.
Also I hooked up my OBDII scanner again and was pleased to see that with a hot engine the idle fuel flow is actually 1.6lph not 1.7lph. Still very high...