Worse gas mileage than before..

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Nov 13, 2018 | 05:31 PM
  #1  
Howdy everyone,
First off I have a 00'XJ Sport with 193,000 some odd miles, and I just wanted to let ya'll know that I've been getting worse mileage day by day, just to give an example, I used 3/8s of a tank doing a 50 mile round trip. I know for a fact that's worse than what I usually get. I've also noticed that whenever I have a constant foot on the pedal my RPMs rev up and down two or three times between 1750 and 2250 RPMS, really weird as if I was trying to rev my engine to look 'cool'. I'm thinking its most likely that my fuel injectors are clogged up but I don't know what the heck it is for sure.
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I would just like to know what might be causing the issue, just worried because its my daily driver..

Thanks!

"The education of a man is never completed until he dies" -Robert E.Lee

2000 XJ Sport//193k//4WD//4-door//Dana-35//Wrangler Bumpers // Gadsden sticker
1997 Dodge 3500//Hemi 5.9L// Dually//Pieceofsh**//Sittin for 3 years and probably will forever
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Nov 13, 2018 | 06:22 PM
  #2  
First question that must be asked is if the Check Engine light is on?

Next, it sounds like your torque converter is going in and out of lock-up when cruising, which would explain the jumping up and down between the RPM ranges you mentioned. This could be caused by several possibilities such as a failing solenoid in the transmission, or something more mundane like a brake switch that is occasionally sending a false positive to the computer (do you ever notice your rear brake light flickering?). It could also be caused by a throttle position sensor that is failing.
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