I also have this smell. in mine it is so bad that you get headaches and nauseus (? sp). i dropped it off at the dealer thinking the cats were plugged. dealer said everything checked out ok on the exhaust. they couldnt find anything wrong so after they replaced teh cabin filter they asked me to pick it up. I politely refused until they fix it. They aparently never drove the car to actually get a whiff of the smell. after driving the car around, the service manager called me back and said that he smelled the odor but has no clue what it could be. first, they guessed maybe a mouse died in the car somewhere. after tearing the car apart and not finding a mouse, they sent a message to fords technician bulletin. appaerently, the awd system has been reported to be the culprit and they have no fix for this yet. ford told the dealer to give me the car back and run it on recirc until they find a solution. supposedly running on recirc will minimize the amount of fumes coming into the car. my service manager told them no way is he returning a customers car that gets him sick. so for now we wait to hear what else ford will propse to do. at least i get to drive a beautiful sea foam green focus.........
By the way, i have a 2011 ford edge sport with 15,000 miles.
Thanks,
pete