Have had the same problem as you guys with the raw gas smell, as well as the smell dissipating by the time they get it up on the lift at the dealer. Even though it is a very intermittent problem, I usually notice it more after I have had to brake hard to come to a stop when I have a full or near full tank of gas. I couldn't find any visible leaks prior to taking it to the dealer. After talking to several people, one advised that there is a large round disc or plug, for lack of a better description (I don't know the technical name for the part), through which the fuel line and other things go into the gas tank from the top, and that there is an O ring around it that may have gone bad. This seems to make sense. Sudden braking on a full tank of gas could cause gas to leak pass the O ring and onto the top of the tank. At my earliest opportunity, I'm going to do several hard brakes and try and get the car in the garage and up on jack stands to see if I can feel anything wet on top of the gas tank before the gas evaporates and the odor dissipates. Since some of the posts on this problem are a little dated, I was wondering if any of you got the problem resolved on your cars and it turned out to be what I am referring to.