Big Problem!

[Crysis]

Alright, it seems I have a gas leak and the problem is I cant find it. There arent any puddles under my car or outside smells. The gasoline smell is inside my car and it has been there for about a week now and it only seems to get stronger! Plus, I am about to only get 250 miles in a 18.5 gallon tank...thats 13.5 mil.gal! And today my gas light came on at a 1/4 a tank, which is very unusual because it only comes on once the needle passes the E mark by a mile.

Is my gas gauge broken? I have looked under my car numerous times trying to find nething leaking and there is nothing (not even a smell) . I thought that since the smell is only on the inside of my car then i could of gotten it on my clothes when pumping gas, which has happened before, but now im worried. Any help like where someone else may have had gas leaks?