jiggie

So my 92 xj is bone stock, and I'm only getting about 145 miles to a tank of gas combined highway/city driving. Example I filled up on Sunday took about 12.5 gallons and drove about 30 miles and the gauge was reading 3/4 tank. Then yesterday I drove out of town for work and back which put my odometer at about 165 and my gauge between 1/4 and empty more towards empty. I filled up and it took about 16 gallons. Why am I getting such poor milage?

chrisf695

I get between 240-270 with 245-75-16's and 2 bb. I would run a tank with seafoam first then go ahead with a Tune up of cap, rotor, plugs, and wires. Go from there, that will be only a 70 dollar start. Good luck!

RTorrez1

I can get any where from 260 - 275 mile to the tank depending on how hard I drive it and also the brand of gas my 98 XJ does have the 20 gal tank and I do have a 3" lift running 30x9.50-15. You should give yours a good tune up. At least that's what I would start with

GreenClassic

I usually fill up after 300 miles when the fuel gauge is sitting about 1/4. So I could probably go another 100 miles. Most of my driving is highway.

NorCalJeep

i was getting that kind of mileage on a 2" with 31 muds; took it to a mechanic discovered my distributor needed replacing. Try checking: the distributor, spark plugs(gaping), BOTH o2 sensors, wires, and maybe check the for stuck open fuel injector. Or it could even be someone stealing your gas.Good luck

djlarroc

how is your jeep running? what size tires? auto or manual?

i have a '97 auto 4.0, stock on 225/75/15s. i get about 225 miles per 14.5 gallons = 15.5 mpg. i drive about 70% city/30 hwy. Still disappointed in the mpg. should be getting about 18 i'd say.

run seafoam 1st, then do a tune up and see how it changes.

austinjoe13

I get between 250 and 300 on about 15 gallons around home. But when I go visit my dad 160 miles away I average 25+mpgs with an average speed of about 62mph I'd say.
1989 4.0 auto 4" lift 31s and 3.55s. Also last winter I averaged 15-17 in Full Time.
My worst was 11mpgs this fall in our first snow but I'm 18 and I did what most 18 year olds would do in fresh snow
I'm happy with 15+
Check your air filter also.

chopej93

ide start with a tune up then maybe clean your injectors down here we run sea foam threw a vacuum line your car will smoke but thats just the carbon burning off

jiggie

Yea mine is a stock 92 same tires auto trans. Ima try this seafoam thing and get a tune up plugs wires etc. It just had an oil change and air filter when I bought it....

Update I've driven 33 miles intown today and it says I've used 1/4 tank........maybe my gauge is bad? Maybe this lack of fuel milage is also causing my smoking issue when I acclerate?

Manic Mechanic

Whoa, now that changes things a little don't ya think? What color smoke?

-Eric

austinjoe13

If the smoke is white and has a sweet smell you've got a blown head gasket. If its blue then you're burning oil. Either way its bad!

revsxj

i get about 250 or so with 5 in lift and 33s.

jchat

My 96's best tank was 230 miles. I have the 20 gallon tank. But Ive got a 4 1/2 lift with 33's. I think it should be better than that but I dont really know.

lookin2wheel

Stock '91 Laredo 4.0L 5 speed. I can get about 340-375 per tank. 340 back and forth to work...lots of stop and go, 375ish on the highway running nonstop 65-80 MPH.

lookin2wheel

You might want to look for a fuel leak man. You should be getting way more than 145 miles to a tank. Holy crap dude, how do you afford gas? You could very well have a stuck open injector dumping fuel into a cylinder constantly too. You say it smokes upon acceleration? Is it a white/grey or black? If its white or grey, like posted above you have bigger issues than poor fuel economy. If its black then you are dumping too much gas into the cylinders (running WWAAYY rich)