Your MPG is concerning. I have virtually the same truck, mine is 93 Ranger XLT 4.0, 2 x 4 long bed AT and I routinely get 21-22mpg daily driving. This past weekend I towed a ~1250lb boat and trailer and avg 17.8 up and down mountain passes throuh Central California.
I'm getting around town about 15.5 miles to the gallon.
It seems it depends on the vehicle and possibly where you live.
Please only give me replies with experiences.
Thanks
Save your money.
You're probably doing about as well as you can expect being at ~6000+ feet altitude and doing mainly city driving, which is always tough on fuel mileage.
Keep in mind that you have a 15 year old truck and the condition of the engine will come into play if it has not already.
You wanted experiences...fine. My Ranger was dropping into the 17-20 MPG range last year. On a 94 2.3L/5-speed. End result, zero compression on cylinder 4. Oh well, 284,000ish miles does that.