Got my grill block done today:
This is a test one out f heavy duty cardboard and I am going to test for the next tank or so. I did a short 10 km test and no colling fan running, with a temp increase of only 6C to a running temp of 79 degrees C.
The upper block is packing tape for now as well:
Here hoping to a consistent 35-36 mpg. Belly pan and new lowered shocks and struts to come this summer.