Dropped the extended diffuser about 1/2" after I got to Wichita. I'll see what it will do on the trip home. Not sure if the cold front affected my MPGs as much as it did but it was about 21.5mpg between Ardmore and Wichita...which is normally well above 26mpg during the summer runs.
Ended up cutting the side skirts...I'll see if this does anything fer the crosswinds or not.
I'll paint the beam flat black later on before I start driving back home.