i have a 98 ranger 3.0 5 speed 4x4. i do the live data on it and its shows every thing is good except for the stft (short term fuel trim) on bank 2 sensor 2 stays at a -100 and does not fluctuate while driving. i think this is part of the reason i am only getting 14 miles to the gallon. i think it is the downstream o2 sensor but not sure looking for some info or advice on what you guys think

 

There is no bank 2 sensor 2 on your truck; that's why the scanner says that the STFT is always way out in the weeds.

 

I'm sure 14 mpg was the best my truck ever was new lol. That seems pretty normal

 

well that explains why i cannot figure out how to fix it. thank you guys for all the information.