Yes, I have upped the tire pressure. I have been driving for 25 years and (though I am sure I will get flack for this) I have always run my tires at 5 pounds over their sidewall pressure. I know many people will disagree with doing that. However, I have never had a blowout and I have always driven 20,000 to 35,000 miles per year for work. I have seen shops seat beads and it takes a huge amount of pressure. So, an extra five pounds is no big thing. Also, I get an enormouse amount of miles out of a set of tires.
Anyway, I drive so much for work that I figure it is time to get serious about mileage.
Hmm, maybe a CNG conversion on my future C-Max would be cool.
Matt