You're sporting a lift and bigger tires. Your gas mileage is going to suffer. You're in the right range for gas mileage. I believe your XJ has a 20 gallon tank. If you're getting 200 miles on a 20 gal tank, that's 10mpg. If it is a 15 gal tank and you're getting 200 miles, that's 13.3 mpg...which is about right for a lifted/big tired vehicle. It looks like other members have led you down the right path, so welcome to the CF, keep us updated on your XJ and enjoy the site! By the way, I'm getting about 15 on stock tires/lift with my '00 XJ...I'm going to clean the TB out this week when it's warm.

 

good luck, and remember, if you want milage, get a cr-v ha ha

 

you people slay me. he is not getting 200 miles he is getting more. stock gearing and bigger tires throw it off. 20 some paercent. he is probably getting around 17ish which is good.

 

for 600 this is a good deal. saves u hassle.

http://www.turbocity.com/product_inf...roducts_id=421


heres the four wheeler mag review on it bumped up the mpg quite a bit

http://www.4wheeloffroad.com/brandpa...age/index.html


u get an idea though im sure if u bought better parts it would get u better mileage. AFE cold air or Banks. poweraid throttle body spacer. replace the whole exhaust from headers to tip. plugs wires cap distributor coil.

 

thanks again everyone for the advice, i think i will start buying some add ons to improve the gas mileage. its better then putting gears in it for what i want. i figured if im gonna put gears in it i mine as well save up for lockers too, so that will have to wait.

 

last question. i dont have the correct speedo gear in it for my size tires, so is my od currently counting the miles slower or faster?

 

That's correct. The speedo errs 19.13% on 33s versus stock, which is 27.7". So, add 1/5 to your gas mileage, which is, at an observed 11 mpg, 13.2 mpg. Still not very good, tho. The lift adds some negative aerodynamics, too. O2 sensors can be borderline bad, without throwing a CEL. Rule of thumb is around 100k miles for them. Check, if your brakes are dragging. CAI, if done properly, increases performance, but not fuel economy. Just some things to consider...

 

If you have 33's on there with stock gears than I think that is probably your biggest problem. I went from stock to 31's and a 3". It was a day and night difference in MPG. I then regeared it to 4.10's and it about back to normal, and has much more power now. All the other things such as seafoam will affect it too. I think the biggest factor is the gears though.

Good luck!!!

 

heres the error (you can figure out the percent for any tire size):

http://www.performanceprobe.com/inde...calc&page=tire

 

well your jeep is trying to push the bigger tires at the same rate that it does with stock tires. so your gears,motor,and trans have to work harder witch means less mpg.change to 4:11 gears it might be better for you

 

This might be the right time to advise you that unless the engine is out of tune, or running "pourly" you'd be best served to save your money and spend it on gas.