I have a 2006 jeep liberty 4.7L, my problem is that i can literally watch my gas gage go down as i drive,it took me a almost a quarter tank of gas to drive less than 20 miles. i have smelled around the car for a fuel leak perhaps but have not gotten anything i am at 76k miles, please help, thanks.

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

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: drastic drop in gas mileage

well you may need to have it serviced even though your not too hard on it. try a complete tune up and see how the milage is affected

SOURCE: poor gas mileage on my jeep liberty

change your spark plugs if they haven't been changed in awhile. check your tires for the propper psi there should be a sticker on the inside of your drivers door that will tell you recomended air pressures go by this not the recomendations on the tires. also where are you getting you gas does it contain ethanol sometimes this can burn faster.

SOURCE: 1999 Jeep Grand Cherokee Died while driving home

check the fuel pump fuse/relay, could be just bad enough to cause an intermittent start/no start. and check fuel pressure,spark and the crank position sensor.