ok. First off, let me say that I"ve already searched this topic. I have done the following things to my car as maintenance. I bought a 94 integra LS 125k with automatic transmission.

1. Sea Foam-ed the engine
2. Cleaned Throttle body, then changed the oil
3. New spark plugs, wires, and rotor cap
4. Alignment and rotate and balance on new tires
5. Changed transmission fluid- Honda ATF
6. Flushed radiator and changed antifreeze

I did all this on thursday. Then I filled up my car with gas thursday to the full mark, and put fuel injector cleaner in the gas tank when I filled it up. I have gone 104 miles since then, with the AC both on and off, and I have HALF a tank of gas!! What the heck is up?

The only other thing that I can think of off my head would be the O-2 sensor, but wouldn't the check engine light come on or something to let me know if I have a bad oxygen sensor and my engine is running rich/lean?

What else could I try to increase my MPG? This is driving me nuts, because I drive about 70 miles a day to work- and need good gas mileage! Help!!!!