So far on my 2004 Mustang V6 convertible Automatic I have:
45 PSI in all tires (recommended is 35, max is 55)
lower "Grille Block"
this is before the Grille Block and the dip job
This is after i placed foam poster board in the openings and then covered them and sealed the opening with duct tape
This is the look after I Plasti-Dipped the car
I did an A-B-A today using my dashcommand app, since my scangauge isn't here yet. I averaged 26.9 mpg, I consider that quite a feat since I start and end by going through the city, I saw glimpses of 40 MPG around 60-65 mph on level ground.