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Sounds like it's time to replace fuel filter, or possibly a bad fuel pump. I'm uncertain why the gas pedal would be hard to push as it most likely isn't a cabled type on that new of a vehicle, but you can check by looking at the top of the pedal itself to see if there is a cable and if it's possibly frayed.
Do the following:
1. Clean the throttle body from inside.
2. Adjust the spark plugs gap to 1.00 mm.
3. Check fuel pump pressure. (44 Psi - 49 psi)
4. Remove the negative battery terminal for 5 minutes.
5. Connect the battery terminal.
6. Check the engine oil level and coolant level.
NOTE: Before starting the engine shut off all lights and loads for example room light, blower, radio, parking light etc.
7. Start the engine and hold the throttle at 3000 rpm till radiator fan comes on.
8. After the fan comes on release the throttle pedal and let it idle for 10 minutes.
The flter housing airbox is accessable only from driver's side after accelerator pedal assembly is removed.
There are three screws that secure the housing. The carpet will also need to be pulled back slighty to remove the filter.
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.