Ok, so from this thread, you can see I went through a couple grill blocks. After a bit more reading, I decided to go with a third type of block. Without a grill block I would hit a max of 166F on the coolant.
This is largely due to the huge air dam in front of my car causing an additional effect of drag puzzling for a car with the shape of mine. (0.36 total apparently).
A nice grill block would effectively help in both cases. here is a pic of the newest grill block. Additionaly, I will have some wheel covers, I should have pics of those installed tomorrow.
Notice the "air dam block" as it really isn't a grill. I'll be switching those bright yellow push pins for flat head tacs tomorrow along with putting on the wheel covers. It should be virtually invisible
oh btw, I did get 51.3mpg coming home today, my best so far has been 47.1 on a "perfect" day.