I have a 2002 edge 4.0 4x4 it gets horrible gas mileage. I have changed the oil, changed plugs and wires, new air filter, a few vacuum lines and pcv valves. How many miles should I be getting from a tank this is my first 4.0 ranger i have owned around 7 rangers now and this is by far the worst gas mileage I have ever gotten from one

Change your fuel filter yet? How often do you run injector cleaner? My 4.0 averages anywhere from 17 to 21 depending on how I drive it.