What kind of gas milage are you gettin

[Hemenechi]

I have a stock 94 xj I6 auto and i get about 200 miles city to a 18 gallon tank. so thats about 10mpg... i have a cracked manifold and muffler, 235/75/15 tires.

im hoping with 4.5" lift and 32" tires, banks header, high flow cat, and dynomax cat back exhaust and a tune up would pick it up to at least 15 then ill be happy

 

[Tony97]

My mileage varies quite a bit, with a worst tank of about 7.5 to a best tank of about 18 (without correcting for larger tires, so actual is a little better), and with a median of about 13mpg. It's a '94 w/4.0 auto, 31's (265/16 in winter, about 32"), stock 3.55 gears and junk on the roof just for the added wind drag (lightbar & rack). Oh, and the heavy right shoe.

My previousJeep, an '85 2.8 auto with all the same junk surprisingly got about the same best, worst and median figures. (but the '94 can get up and go, whereas the '85 couldn't even get out of its own way, going downhill!)

I'm also a poor (albeit old) college student too, so with the gas prices as they are, I'm relegated to driving my Neon most of the time and saving the Jeep for those "special" circumstances. Neons just aren't all that good off road, and they'd look darn funny with a snowplow!

 

[carmike692000]

I get 16-17mpg in my stock '95 2-door Cherokee with the 4.0 and auto. Admittedly, I have a heavy foot.

 

[WB9YZU]

No! How many gallons did you actually put in after travelling 320 miles? You don't calcualte it based on the gauge...ever. You start with a full tank, travel a certain distance, and refill the tank - that's it. Distance traveled / gallons filled = miles per gallon.

Is your speedometer corrected for those tires? If not, that will also effect your calculations.

Yah, some of these guys need a refresher on how to calculate MPGs.

1) For an exact reading, use the same pump each fill up with the vehicle in the same orientation.
2) Correct for odometer error. If you changed your tire size, find out by what percentage the diameter changed and do the math. A larger tire will make the Odometer read less milage than you traveled.
3) Put in gas and round the resultant figure to the nearest 10th gallon.
4) Read Odometer, and multiply by correction factor.
5) Divide resultant distance by gallons pumped.
6) Repeat.

You can not estimate how many MPGs your truck is getting by "guessing" or "estimating" the fuel used by reading the fuel guage. XJ fuel guages are famous for one thing; only reading correct when they are empty, actually, not even then

Now with that in mind, I'd like to see a bit less "guessing" and a little more fact.

My last odometer at fill up read 221, and I put in 14.4 gallons. Correction factor for my 31's is 1.09. 221X1.09= 241mi divided by 14.4gal=16.7 mpg with 87 octane. That is city driving.
98' 4.0L auto, 4" lift, winch, 31" MTs @30lb.

 

[MaXJohnson]

My mileage varies quite a bit...

Good info Tony. I'd read that your mileage may vary. This confirms it.

 

[xjaddiction]

about 9 to 10 on my stock MJ '88

 

[LS1Jeeper]

96 4.0 auto stock gears 285 MTR's 18 highway 12 around town/trails

 

[FreeXJ]

I have an 89 with an RE 4.5". I am running 32X11.50's and stock gearing (auto trans) I get about 14 mpg.

 

[Nixt]

Two cents:
'96 3.5 lift, 29" tires (now with hi-flow intake, 2.25" exhaust man-back/no-cat.)

14 MPG city (I drive it hard, though, and 'gun it' all the time. ;-) )
Avg. from refill calculations over the last year before intake/exhaust.
22 MPG Highway, full load in back.
Based on three round-trips: Roch., NY to Ft. Laud FL. in '00, '03, and '04.

Note: Intake and exhaust done 6 mos. ago - seems like so far I picked up 2-3 MPG city. But that may also be contributed to by new coil, plugs and wires.

 

[rallyemore]

Its not just that we can't afford gears, but its also kind of hard to install them when the only place you can work on your jeep is in the dorm parking lot.

Haha, save up some more and take it to a specialty shop to intsall them. It only cost me about $1100 for parts and labor...

(Yeah, I'm a student too)

I get something like 16-17 during the winter, but I got 22 last summer doing 60mph over 100 miles. (During the winter, the air is denser, so to compensate, the O2 sensor or the Aair mass flow meter, I forgot which one, pumps in more fuel)

1996, Automatic 4-speed, 33's, 4.56's.

When I really play with the ricers I get something like 10-12. Same on the trails. Thats why I got a motorcycle. 56 mpg bitches! :looser:

 

[Dave in Eugene]

'87 4.0 5 speed, bone stock. Haven't checked the gearing so I don't know where it is for sure, but it's low enough to take off in second gear with no problem.

Gets solid 22 MPG on highway, around town it barely gets 12.
Of course my commute to work is only one mile so it doesn't get warmed up most of the week.

I think the highway mileage is pretty good considering the squareness.

 

[Dave in Eugene]

im hoping with 4.5" lift and 32" tires, banks header, high flow cat, and dynomax cat back exhaust and a tune up would pick it up to at least 15 then ill be happy

I wouldn't count on most of that improving mileage. Lift & big tires are guaranteed to eat more gas, and the planned exhaust mods are likely to do the same. Tuneup can't hurt but not much you can do but change parts that are out of spec. Some folks suggest getting a high altitude cps to advance the initial timing. That's something I plan on trying when I need to change it.

 

[2ThornZ]

By my stock overhead computer thingy, my '01 limited running 225/70/16's would see over 20mpg on the highway, I think I actually saw 22 at one time.
Now, running 255/70/16's (about 30x10.00) It won't do better than 17mpg on the highway. At this point, I think my speedo is MORE accurate than stock, so I'm thinking my mpg is NOW MORE ACCURATE too?? It's usually showing around 13-15 round town.

My 98 gets 27 hwy. 21 cty.

 

[Yucca-Man]

My 98 gets 27 hwy. 21 cty.

Your '98 WHAT gets that kind of mileage?

 

[2ThornZ]

I'm sorry, but I have to call :bs: on some of the numbers here. I don't know how y'all are figuring out your mileage.

But...how many miles can you go on the highway on one tank of gas? I know that I can get from home to Vegas on one tank. That's 280 miles. Divided by a 20 gallon tank comes to 14 mpg.

According to some of the numbers posted here, people are getting 400-500 on one tank of gas. Meaning you could drive coast-to-coast on 5 tankfuls.

Actually ,,inthe summer i get as much as 573 miles per tank 98 grand ch. 4.0 HO

 

[jrsxj98]

My 98 gets 27 hwy. 21 cty.

:bs:

 

[2ThornZ]

Actually ,,inthe summer i get as much as 573 miles per tank 98 grand ch. 4.0 HO

Oh, how bout 632 miles Tops,when I drive my wife to reno, or vegas for her espn bowling nationals !!! So THere Math Wiz. {Everything is all down hill from here !}

 

[casm]

Your '98 WHAT gets that kind of mileage?

Ever since I installed my Mr. Fusion, my XJ gets 62345 miles per bag of kitchen waste and can travel through time. It's true!!!

 

[lazarus]

I was pissed when I found out my 98 4.0with 31*10.5*15 was gettin 13.5-14mpg, and dads 99 4.0 stock is getting 19.5-21mpg. what gives? does going lower gears REALLY make that big a differance, I think im running 3.55s and a stock motor cept kn cold air intake

 

[Mud on the Tires]

Lower gearing will definitely affect your gas mileage. I have 1996, 5spd, 33x12.5's, with 4.56 gears and I average about 14mpg around town and 19mpg on the highway. I'm sure the full size spare, roof rack and kc's on the roof don't help with all the wind resistance either. But hey I didn't buy the truck for the gas mileage, but for the pure fun of wheelin.