For Christmas, my wife and I agreed to buy ourselves presents and say they were from each other so we could focus on the kids. I picked out some snap on Moon discs and finally got them on:
With the cold temps and having to scrape/melt ice off the car every morning, it's really hard to compar mileage before and after. But, they look cool and can't hurt.
You can also see the air dam a little better here.