Drastic drop in gas mileage

SOURCE: jeep liberty gas mileage

when was the last time you put in fuel injector cleaner? I put in Lucas Oil Injector cleaner every other or every oil change.

There are alot of factors affecting your gas mileage. Tire wear, tire pressure, wheel alignment, air filter, fuel filter, spark plugs, oxygen sensors, just to name a few. So to say what you need is just shooting in the dark without more information. I would probably start with your oxygen sensors, and then perform a tuneup. If your vehicle pulls to one side or the other when driving on the highway you need to stop into the shop for a wheel alignment.

SOURCE: poor gas mileage on my jeep liberty

Did this happen overnight or was it a gradual loss? Did you do any kind of repair before you lost the gas mialage? Is there a check engine light on or did it come on and go off? Did anything weird happen before the jeep got bad gas mileage? It's hard to diagnose a problem like this without actually touching the car.
Any other info might help me steer you in the right direction.

SOURCE: jeep liberty gas mileage

You might also want to vary where you buy your gas. I lost approx. 5 - 6 miles per gallon (translates to over 100 miles less per tank) earlier this year. After conducting a bit of an experiment I realized it was only when I bought gas from one particular distributor (Spinx). I have since stopped filling up at all Spinx stations and my mileage has returned to it's previous level.