Omg Help!!!

[SupraDietrich]

I realize it might sound like i'm fraekin out, and because i can't get onto the avenger forums i'm asking the supra guys, because that's my next car lol, anyways, i need help, i've gone through 30 bucks in 2 days of driving in my car, the milieage is so terrible and usually it's amazing, and i got my car home tonight and opened the hood to hear a very loud knocking, not from over the engine but when i croutched down infront of the car, it's a 2.5L V6 auto, and the sound was coming from behind the fog light, the belt is around there but this didn't sound like a belt problem, anyone have any ideas ?, i couldn't check itout properly now cause it's dark out already but i'm freakin out and i can't afford to drive it like this, the mileage is so bad, and my engine light keeps coming on, AH!, any info is GREATLY appreciated, thanx, your fellow supra/avenger enthusiast, Dieter P.S. there's the engine overview if that helps... if anyone wants to know what i might think is wrong, i'm thinking maybe the O2 cencor on my exhaust manifold is shot, but the knocking i can't explain at all, also i was wondering if the knocking could be lack of gas in the tank, like if it's running off of fume would it do that cause i barely made it home below E...