I personally do not have an edge (I have a 2wd F250 PSD and a 1996 GMC K2500 4x4 6.5 Turbo Diesel), BUT my parents have one with 34k miles. They went on a trip last summer and got over 27 mpg with the A/C on the whole trip @ 60-75 mph while on the highway. Thats great for a 4500 lbs car with a v6. Keep it for a long time, it will last. The bumper to bumper warranty was up to 30k miles for ours and the powertrain (i think)/corrosion is up to 60K miles.

The only thing I don't like about the edge is the lack of dark interior choices.