Thanks for the information. Tires are great, almost new and we have a compressor and gauge. That was the first thing we checked. I am a very safe and sane driver, so my driving is not an issue at all. The sales person told us to expect about 18 MPH locally, so the mileage is not that off if that is an accurate number. We live in the Pacific NW, so temp. isn't an issue, either. I will keep researching, but this gives me a good start to make sure I've covered the basics. I see the new Edges are coming out with some improvements in these areas, I will be curious to see how the mileage is affected. I expected to get a lot worse mileage than the supercharged 4cly. Mercedes, but I wasn't expecting the same miserable mileage my husband's Jeep Liberty was getting. He improved his mileage over 2 mpg when he replaced his air filter set up with a cone unit, but he doesn't think it's worth it for my Edge because I mostly drive local, short distances every day. I was just suprised to see the mileage wasn't much better when we took it out for a long Sunday drive on the highways.