Okay I had this happen to me today under the exact same circumstances as jaaX3. I was coming down the mountain from skiing. I was at probably 3000 feet and temp was 40 degrees. The highest elevation that I was at was about 7000 feet. I don't know if this has anything to do with it but is seems strange that I would have this during the same circumstances. I have only 1600 miles and have only had the car for 5 weeks. My dealer so far has been great and is getting me in on Monday with a loaner. The gas cap is tight.