So my HCH II was missing the main splash shield under the engine and the one just in front of it that connects to the bumper.
I got the main one done a few days ago and it seemed to bump my average mpg up, my record was 52.3 and I got 52.9 on my last tank, I filled up tonight and put the other splash guard on so my car is back to stock now.
I will see how much of a difference it makes to my mpg now, I suspect only a couple of tenths but it will put me over 53mpg!
