55psi. Damn !!!!

 

Try relocating your IAT (intake air temp) sensor. It is currently on top of the hot aluminum intake plenum. Remove it from there put a 1/4"NPT (u think that's the size) plug in the hole. Drill a hole in your in your intake tube and install the sensor. I picked up 1mpg with this alone and I am on 35's w/ 4.88 gears and a 5 speed 2000.

 

from what i understand this wont work on later models. I wanted to do this to and was told by someone on here that it wont work 97-01's can anyone confirm this?

 

Dang yea something must be really wrong! Lol

 

I got about 15 mpg with an 01 xj 4.0 i6 2wd and auto trans, with a 91 head and 94 exhaust on it. Just all about how you take care of her and drive it!

 

MPG update.

Running 32's stock gearing, 40psi.

Drove 1.5hrs to off-road event. Wheeled all day from 11am-5pm. Drove 1.5hrs home.

14.86mpg! Now that's pretty good. Drove for two more days on same tank.

 

Clean the injectors clean everything! When your motors working perfect you'll notice that when it's running perfect you'll do better with gas !

 

Sounds like you may have a tranny or torque converter slippage problem. My Jeep does the same thing but it has 271K+ miles on it and I know my tranny is getting worn out after years of 4wheeling and lots of miles. It guzzles gas in town no matter what but as long as I keep it at 65-70mph on the highway it gets 18 mpg. Anything over that at the mpg rapidly drops off. I am also on 33s with 4.56 gears and locked front and rear. I'm pretty happy with that mileage for the setup I am running. I beat up the body a lot but I am a **** about keeping the drivetrain healthy, clean and tuned up.

 

I have a "00 and it worked got me an extra 1 MPG. That's why I suggested it. It does work.