Well, some might argue I'm polishing a turd, but I'm going to try anyways. First step is a partial grill block on my 2003 Silverado. The entire grill just snaps in place, so it was real easy to pull off. Since it wouldn't pass the wife test otherwise, I went for the stealth block behind the grill. I'm not sure how much support is needed (if any) but I wanted to reinforce the attachment points a little, so I used some small, flat steel plates I had laying around.
No results yet, and I don't have the time to do rigorous A-B-A testing, but I keep close tabs on fuel usage and driving habits so I should be able to see what, if any difference, it makes.
Mike