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How many mpg are you getting? Im getting less than 8. It's only slightly modified (2 inch lift sitting on 31's) The guy I live with says that the mods are why it's getting the mileage that it is. I say it's all the mechanical issues (see my other posts)

BTW the guy also says that there is nothing wrong with the mileage I am getting.:brickwall:
 

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How many mpg are you getting? Im getting less than 8. It's only slightly modified (2 inch lift sitting on 31's) The guy I live with says that the mods are why it's getting the mileage that it is. I say it's all the mechanical issues (see my other posts)

BTW the guy also says that there is nothing wrong with the mileage I am getting.:brickwall:
lol he is high. 8 mpg I'd check for a line of fuel streaming from the gas tank.

I was getting 10 mph jumping on it and running 3:55 gears. 4:56 gears and normal driving helped a lot.
 

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I can get 20 mpg running at 65 mph out of my 2000 XJ. It averages around 15-17mpg in mixed driving. Anything over 65 and mileage drops off drasticly.

BTW, that is with 31's, and 3.55 gears.
 

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I can get 20 mpg running at 65 mph out of my 2000 XJ. It averages around 15-17mpg in mixed driving. Anything over 65 and mileage drops off drasticly.

BTW, that is with 31's, and 3.55 gears.
You are one lucky guy.
 

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lol he is high. 8 mpg I'd check for a line of fuel streaming from the gas tank.

I was getting 10 mph jumping on it and running 3:55 gears. 4:56 gears and normal driving helped a lot.


Oddly enough I recently repaired/replaced a leaky fuel rail and all my fuel injectors (one of those was leaking) Even with the leak I was getting 10-12 mpg. But now...................

I thought maybe someone was stealing my gas but I do have a locking gas cap. Then again the dumbass who says there is nothing wrong with the mileage I am getting does have a key Mmmmmm.................
 

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Oddly enough I recently repaired/replaced a leaky fuel rail and all my fuel injectors (one of those was leaking) Even with the leak I was getting 10-12 mpg. But now...................

I thought maybe someone was stealing my gas but I do have a locking gas cap. Then again the dumbass who says there is nothing wrong with the mileage I am getting does have a key Mmmmmm.................
I've tried several things to improve my gas mileage, I'm thinking of replacing all the injectors next.
 

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Im getting around 17-18 mpg with 35's and a 6" lift with 3.55 gears but thats not getting in to big of a hurry . I run about 55-60 on the interstate.
 

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on highway with some wheeling I get 17.5 mpgs on city I get from 13.5 to 15 mpg..depends how do I treat my gas pedal
 

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I'm getting between 13-14 in town with 33" and 3.55 on highway I am getting about 17 but I just done a tuneup and this motor only has about 75K on it
 

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Oddly enough I recently repaired/replaced a leaky fuel rail and all my fuel injectors (one of those was leaking) Even with the leak I was getting 10-12 mpg. But now...................

I thought maybe someone was stealing my gas but I do have a locking gas cap. Then again the dumbass who says there is nothing wrong with the mileage I am getting does have a key Mmmmmm.................
Change the cap and don't say anything and see if mpg improves :p

That low of mpg is just absurd
 

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I have to ask to everyone who reports low fuel economy... Did you recalibrate your speedometer?

Most people don't. Then they wonder why it sucks so bad.

Anyways, 8 is low either way. If it's a renix, I'd suspect the O2 sensor needs replacing, and I'd do the general other things (check the TPS, look for leaking injectors, look for other fuel leaks, check the other sensors with a meter, oh, and you might have a stuck injector).
 

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I have to ask to everyone who reports low fuel economy... Did you recalibrate your speedometer?

Most people don't. Then they wonder why it sucks so bad.

Anyways, 8 is low either way. If it's a renix, I'd suspect the O2 sensor needs replacing, and I'd do the general other things (check the TPS, look for leaking injectors, look for other fuel leaks, check the other sensors with a meter, oh, and you might have a stuck injector).
Yup I did, still lower then I would like.
 

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Fuel mileage

I got 31's/3.55 gears/5 speed/AND a roof rack and I'm gettin' 17.5 city and 20.4 highway!!!!!!!!!!!! I think I'd forget about the locking gas cap and try a new boyfriend!!!!!!!!!!!!!!
 

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I just had to fill mine up again, and with about 70% city and 30% highway I got alittle above 16.9 mpg.
 

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Have you checked your fuel pressure? Should be around 39 psig. Also when you have the fuel gauge on it unplug the vacuum line to the fuel regulator and see if your pressure goes up to like 40 psig. If it is low change your fuel filter first and do the checks again. The mileage on my 95 and the 92 xj's, and 89 mj have all had this problems over the years. If your fuel presure is low , you will have bad mileage, If your pressure is ok, try some fuel cleaner, at least two tanks full.
 
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