I didn't have time to get the side skirts going, but I did have time to buy a 5/8" black rubber hose to stuff in between the bumper and the fender/front grill gap. $12.99 for 10' at local hardware store. Stuffing it in between the bumper and fender - priceless.
I don't have a starting baseline other than seeing if there is or seems to be a difference with these darned headwinds. I know it's only a 5/8" gap, but it goes all the way around the front and it would seem to let a lot of air through to smash against the innards, so I plugged it up in a temporary manner. Outlined in yellow on the pics.
If it is something I'm going to keep...I have aluminum tape that can be rolled on flat so it will actually look chrome, or maybe it will stay black, the jury is still out on that detail
Pic's attached,
Mark