I've noticed when the car's sitting and idling, it tends to smell like gas. Doesn't matter if it's warmed up or not, it's just something I always smell if I'm sitting at a light with the windows down, or if I'm letting the car warm up for a minute first thing in the morning. I asked my mechanic to look it over a while ago and he didn't find anything wrong, so I pretty much ignore it. But it really shouldn't do that, right? Any ideas?