OK so I am taking your advise on the full belly pan.
So far I have covered from the front bumper to about 4" behind the front wheels. I used lexan. Reasonably easy to work with and durable. Difficult to photograph, I will work on better pictures.
I also am using a grill block. 3" grill block. OK it is actually 3" wide tape. I have left one row of openings free in the top grill and 2 open in the bottom grill.
Around town the underhood temperature is around 120F and goes down to ambient temperature at highway speeds.
I figure that I am good to go to the rear axle but over it and on to the rear bumper????
EPA mpg Highway 28 mpg
Recently observed on the highway with cruise set at 70 mph 31.5 miles per American gallon.
37.87 miles per Canadian gallon.
ac was off.