92 SE Drinking too much gas

My 92 se is now down to 8 mpg and i've quit driveing it. I know for a fact that my gas tank isn't sealed right and i'm wondering if thats what is causeing it to use so much. It also has a fuel leak but even with the leak i was getting like 25 mpg. I've changed the oil and all the filters and just put in a new o2 sensor but nothing has changed. Any ideas?

how long since you've changed the plugs and wires? If you did, did you use a quality set or some Bosch/Zenith crap from Auto Zone?

When You Changed The Oil Was There Full In The Oil. If Not Check Your Coil Packs. If You Have One Out You Will Use Alot Of Gas.