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mcbrado
December 17th, 2009, 12:42
Hey guys,

I am averaging about 280 miles per tank of gas (pushing below the e a bit) and that seems a little low to me

I am wondering two things:

Exactly how big is the tank? I have filled well past 18 gallons.

Also, what kind of gas mileage should I be getting?

It is half highway driving and half to and from work/store
I have a 98 Cherokee sport with a 2 inch lift, 4L

Thanks

B

kastein
December 17th, 2009, 12:52
Been done to death already... I'll play though.

Before lift, I averaged around 340-350, tank took 19 gallons or so to fill. My 97+ plastic tank in my 96 XJ takes 19.6 gallons to fill when I run it dry.
My peak mileage as a stocker was 487 miles in one tank, driving like a bat out of hell from central mass to long island and back, mostly highway miles at ~85mph.
After lift, but before tires, I was averaging around 310-320.
After lift and tires, I average around 250 "miles", I have not corrected my speedometer so that's more like 280 or 290 miles.
I'm changing to 4.10:1 gearing from stock 3.55:1 soon, and going to brand new 33s instead of my worn 32s, so it should be interesting to see where I end up - I'm betting around 310 to 330 actual miles.

offrd3
December 17th, 2009, 13:04
I also have a 98 with a 2 inch lift and 29.5 tires and the best i can get is maybe 240 miles mix.

Tim_MN
December 17th, 2009, 13:04
what kind of gas mileage should I be getting?



Stock or mostly stock, 14-17 mpg city or city/hwy. 17-20 mpg all freeway. 5-10% less during the winter due to low temps and winter blend gasoline.

Remember to adjust your odometer readings and/or mpg calculations for over-sized tires.

Johnnie Walker
December 17th, 2009, 13:07
With my average weekly activites, I usually get around 310ish and when I fill up usually 15-16.5 gals.

snail
December 17th, 2009, 13:57
heres mine:

1997 4.0 AX-15 all stock @ 245K on 30s --> 300mi per tank

1996 4.0 AW4 3" BB stock gearing @158K on 32s --> 200mi per tank

3/4 highway for those numbers, the rest around town

89xj
December 17th, 2009, 15:16
89, 4.5 lift, 5speed, 4.10 gearing, 31's, 20 gallon tank

summer 300-320 miles per tank
winter 260-280

garr
December 17th, 2009, 15:25
01 auto tranny 120K on the ODO, about 4.25" of lift, 4.56 gears, 32's on moabs, HD front & rear Bumpers + Rails. Truck runs great.
I average about 225 miles average per tank. I can get it up to 250 with mostly highway if I keep it under 65mph.
My speedo was corrected & is dead on.

I plan on playing checking next week to see if I have a bad O2 sensor or something! MPG seems too low!

Phil
December 17th, 2009, 16:01
"Miles per tank" is crap. You need to do the math and convert to miles per gallon to mean anything. There's a big difference between 250 miles with a 20 gallon fill-up and 250 miles with a 14 gallon fill-up.

garr
December 17th, 2009, 16:05
"Miles per tank" is crap. You need to do the math and convert to miles per gallon to mean anything. There's a big difference between 250 miles with a 20 gallon fill-up and 250 miles with a 14 gallon fill-up.

OK, I average about 14MPG.

89xj
December 17th, 2009, 16:26
"Miles per tank" is crap. You need to do the math and convert to miles per gallon to mean anything. There's a big difference between 250 miles with a 20 gallon fill-up and 250 miles with a 14 gallon fill-up.

not for me, i run the tank damn near dry. and dont tell me it kills the pump. after 19 years with my 89, 1 relplaced the pump 5 years ago just for the hell if it even though the stock pump was still working fine. i recently tested fuel pressure on the 5 year old pump and it was on spec.

you can do miles per tank over multiple fill ups by finding your avrage mpg and dividing that into gallons used and gallons not used. yes mpg is a better way, but you can figure out how many miles per tank.

95' heep
December 17th, 2009, 17:32
I like the way to use "miles per tank" to find out if the vehicle get better or worsen mpg because for such as 30 miles increase you know it worked. but with only tracking of "mpg" you might dont think you did got any gain because you only went from 15mpg to 15.5 mpg

I want to say that you'all get good mpg! I have a BlaZeR-2 that only get about 200 miles per tank of 19 gallons (15 or less MPG) and many other ZR-2 owners get similar or less. I really hope my new beater XJ will get much above that MPG/MPT

Pelican
December 17th, 2009, 18:09
Phil said it succinctly -- I'll say it un-succinctly: "Miles per tank is inaccurate".

Fine for telling when you need to fill up -- not much use for comparison purposes.

RoyalXJ
December 17th, 2009, 18:14
11mpg with aw4 7.5" 35s and 4:56s

kastein
December 17th, 2009, 19:11
Miles per tank is extremely inaccurate except for the fact that I only log it when I run the tank dry (fairly often because I am forgetful and haven't gotten my fuel gauge working again yet after my 97+ gas tank swap) so I know I'm using either 19.4 or 19.6 gallons per tank, depending on how long I nurse it along once it starts hesitating.

jeepfreak1020
December 17th, 2009, 19:36
98 sport with 167,000 32's 4.5" lift, armor, and stock gears. 230 in the city, so 11.5mpg, and 260 with the highway and about 15mpg's

winterbeater
December 17th, 2009, 19:50
98 sport with 167,000 32's 4.5" lift, armor, and stock gears. 230 in the city, so 11.5mpg, and 260 with the highway and about 15mpg's

That is all well and good (actually in your case bad), but the subject is miles per tank. Nobody wants to talk about miles per gallon. This is all guts and no glory! Run it dry to get the most miles. If you chicken out at 19.4 gallon fill-ups, you aren't playing this game. Run it dry, baby! :explosion

c0ncEpT
December 17th, 2009, 23:07
My last tank I went 185 miles from completely full to below empty. This is with 35's and 3.55's. Most I have ever done was around 240 with 32's and 3.55's.

MaxxXJ
December 17th, 2009, 23:16
im at 4" of lift trimmed fenders and 33x10.50's with 3.55 gears and stock wheels, in town im about 13-14 MPG (cuz my girl thinks she need's to do rabbit starts) and i have on more than 1 trip i've gotten 19.** mpg. if you do the math 19x19 = 360.

kujito
December 18th, 2009, 00:14
I must have a small gas tank. I try not to let it get below 1/4 on the gauge, which is around 200 miles into it. Takes about 12 gallons at that point.

16.5 mpg

Pelican
December 18th, 2009, 05:58
Winterbeater has a point. While all xj's may have tanks with the same physical volume, some were artificially limited to ~13 gallon fill-up capacity for reasons I have never understood. This coupled with other variables that determine the actual amount of fuel that can be crammed into a given tank by a given pump renders the subject meaningless from the get-go.

Absolutely none of my business and I have no idea why I posted in the first place.

SanDiegoOverland
December 18th, 2009, 06:54
mine gets to a 1/4 tank at around 225-230 or so.

I then usually get about 45 miles more out of it with a gallon or two to spare, so call it 275 miles per tank + a couple gallon reserve.

I tend to only see 16-17gallons go in it at a time.

I have to change out my thermostat, though, and then re-track my mpgs/miles per tank. My motor never gets above 150-175 since I put my alum. core radiator in. This, I think, is keeping the motor in "start-up" mode all the time. When I first got the car, I was getting 19-21mpg's.

that would equal about 325 miles per tank with a few gallons reserve.

kastein
December 18th, 2009, 07:01
I must have a small gas tank. I try not to let it get below 1/4 on the gauge, which is around 200 miles into it. Takes about 12 gallons at that point.

16.5 mpg
With an 89 you're going to have the old style metal clamshell tank with a plastic scuff plate wrapped around it, have you checked if the tank is caved in under the plastic? The old tanks were great that way because the plastic bounces back and fools you into thinking it's just fine.

CaliXJ
December 18th, 2009, 08:51
My 91 mostly stock on 30x9.5s BFGs
95% highway = 17 MPG

89xj
December 18th, 2009, 08:56
My last tank I went 185 miles from completely full to below empty. This is with 35's and 3.55's. Most I have ever done was around 240 with 32's and 3.55's.

ouch, 35's with 3.55 gearing, that must not be fun to drive on the road. i assume you use 4lo when in 4wd.

are you using gps or did you swap out the speedo gear to find out the mileage? without a new speedo gear, the speedometer is off and so is the odometer.

MaxxXJ
December 18th, 2009, 09:03
ouch, 35's with 3.55 gearing, that must not be fun to drive on the road. i assume you use 4lo when in 4wd.

.

you dont use 4 lo ALL THE TIME when in 4wd?!?... wow weather i ran 235's or 33's i always put my xj into 4 lo when wheeling, maybe i wheel different terrain than you do but i need all the help i can get offroad! its better to be in it and not need it than to need it and not be in it am i right?

89xj
December 18th, 2009, 09:20
you dont use 4 lo ALL THE TIME when in 4wd?!?... wow weather i ran 235's or 33's i always put my xj into 4 lo when wheeling, maybe i wheel different terrain than you do but i need all the help i can get offroad! its better to be in it and not need it than to need it and not be in it am i right?

no i dont, i have 4.10 with 31's with a manual trans. when in 4lo, its geared very very low. i can start in 4th gear without trouble or clutch slipping. 4lo in first gear gives me too much wheel spin in some cases. if you need 4lo all the time, your axle gearing is too tall.

iwannadie
December 18th, 2009, 10:32
My trip computer says 16.9mpg usually. When I fill up when the light comes on I put in 15 gallons in and usually hit 250 miles on a tank.

MaxxXJ
December 18th, 2009, 18:16
no i dont, i have 4.10 with 31's with a manual trans. when in 4lo, its geared very very low. i can start in 4th gear without trouble or clutch slipping. 4lo in first gear gives me too much wheel spin in some cases. if you need 4lo all the time, your axle gearing is too tall.


sorta... im 33's and 3.55's BUT i still get 19mpg on trip... my 4 high has always been a little too tall. it shifts too often for me, or bog's down and akes more strain than i wanna do in 4 high, for me in 4 low i can creep easier also keep in mind you have a 5 speed manual compared to my 4 speed auto, so our tranny gear ratios are different

if you lived in CA i'd take you for a ride in it to show you, but pa is kind of a drive. this guy i know had a manual tranny and 3.07's on 33's now that he switched to an auto i BELIEVE he is still running 3.07's on 33's talk about tall gearing

AJTorris
December 18th, 2009, 18:25
ya i have 3.07 stock gears on 33s but even i dont use 4 low all the time.

AJTorris
December 18th, 2009, 18:26
also i get around 13MPG 6.5 lift 33x12.5 3.07 gears after market bumper with winch

89xj
December 18th, 2009, 18:55
sorta... im 33's and 3.55's BUT i still get 19mpg on trip... my 4 high has always been a little too tall. it shifts too often for me, or bog's down and akes more strain than i wanna do in 4 high, for me in 4 low i can creep easier also keep in mind you have a 5 speed manual compared to my 4 speed auto, so our tranny gear ratios are different

if you lived in CA i'd take you for a ride in it to show you, but pa is kind of a drive. this guy i know had a manual tranny and 3.07's on 33's now that he switched to an auto i BELIEVE he is still running 3.07's on 33's talk about tall gearing

i also use 4 hi in the snow. i like low gearing, but 4lo is way too low to drive on the street in the snow.

when i regeared, i was not concerned about gas mileage. larger tires and manual trans with stock gearing sucks unless your concerned with top speed. after regearing, any problems with bogging down or having to downshift went away.

regearing for larger tires was hands down the best thing i did for drivability, on and offroad.

MaxxXJ
December 18th, 2009, 22:06
ok, let me correct myself... i use 4 high for typical driving off road, where mild 4wd may be needed. but as soon as i hit the rocky part of the trail, into 4 lo i go. but yanno my 4th gear in 4 low will do 35-40 mph... 4th gear is a long gear. but any kind of trail i hit where were creeping at 5-10 mph tops i'll put it into 4 low.

AJTorris
December 18th, 2009, 22:52
The only time i go in 4low is when i go through a gate keeper or v-notch. most of the other time im in 4 high. Through Nightmare and Last chance i used 4 hi except for the v notch.

heyhar
December 19th, 2009, 01:28
In three pages of this thread, I've seen only one reference to replacing the O2 sensor, or the proper temp thermostat. Outside of the un-aerodynamic shape of these beasts, those two items are the most critical. If the vehicle has 100k miles or more, the O2 is done. Change it. They start to die, in some cases, in the 80k range.

AJTorris
December 19th, 2009, 01:34
ya also care full with them they are brittle (or at least for me) I have broken two of them just by unpluging them!!!!

Johnnie Walker
December 19th, 2009, 01:55
also i get around 13MPG 6.5 lift 33x12.5 3.07 gears after market bumper with winch
Did you mention you are running an aw4?

AJTorris
December 19th, 2009, 11:23
ya AW4 thanks forgot that lol

kastein
December 21st, 2009, 06:24
:shocked:

why did you swap in axles with 3.07s AND 33s with... an aw4? Or did you just never regear after doing a manual to auto swap?

I'd get that fixed, even if it's just 3.55s it'll cost you like 200 at the you-pull-it and will probably give you a 3mpg boost at least, @ $3/gallon (socal prices? 2.50 around here, guessing 3) it'll take you less than 5 thousand miles to break even AND you'll get some torque back.

cleburnecherokee
December 21st, 2009, 09:21
in my 91 XJ Laredo, all stock, I get about 15mpg city, and about 18mpg highway....4.0 Litre High Output 6 under the hood.

-Andy

AJTorris
December 21st, 2009, 11:08
:shocked:

why did you swap in axles with 3.07s AND 33s with... an aw4? Or did you just never regear after doing a manual to auto swap?

I'd get that fixed, even if it's just 3.55s it'll cost you like 200 at the you-pull-it and will probably give you a 3mpg boost at least, @ $3/gallon (socal prices? 2.50 around here, guessing 3) it'll take you less than 5 thousand miles to break even AND you'll get some torque back.

I just havent had the funds to regear yet after i did the transmission swap. I dont want to waste money on 3.55s. I want either 4.88 or 4.56. I plan on going 35s as soon as i gear it.

jeep ride
December 21st, 2009, 11:27
When it was stock with 225x75 tires I would get 300 miles before the low fuel lite came on.Now with 3 inch lift 31x1050 I get around 200 miles before the low fuel lite comes on.

SteveT
December 21st, 2009, 11:48
That is all well and good (actually in your case bad), but the subject is miles per tank. Nobody wants to talk about miles per gallon. This is all guts and no glory! Run it dry to get the most miles. If you chicken out at 19.4 gallon fill-ups, you aren't playing this game. Run it dry, baby! :explosion

Winterbeater has a point. While all xj's may have tanks with the same physical volume, some were artificially limited to ~13 gallon fill-up capacity for reasons I have never understood. This coupled with other variables that determine the actual amount of fuel that can be crammed into a given tank by a given pump renders the subject meaningless from the get-go.

Absolutely none of my business and I have no idea why I posted in the first place.

Pelican has a point, about Winterbeaters point, about JeepFreaks point...Why bother with all that pesky math and stuff? Let's use the calendar instead. I just found a receipt in my Jeep, and get this...The last time I filled up was late August. CAN YOU BELIEVE IT??!!!!! I've gone almost FOUR months without filling up! That's pretty good, huh?

89xj
December 22nd, 2009, 06:34
When it was stock with 225x75 tires I would get 300 miles before the low fuel lite came on.Now with 3 inch lift 31x1050 I get around 200 miles before the low fuel lite comes on.

what are you using to get the mileage reading for the increased tire size? gps, corrected speedo/odometer gear, or nothing?

winterbeater
December 22nd, 2009, 14:15
Pelican has a point, about Winterbeaters point, about JeepFreaks point...Why bother with all that pesky math and stuff? Let's use the calendar instead. I just found a receipt in my Jeep, and get this...The last time I filled up was late August. CAN YOU BELIEVE IT??!!!!! I've gone almost FOUR months without filling up! That's pretty good, huh?

Last summer, I got 6 month's on 1/2 tank. :party:

Now I fill up my winterbeater every week. :wow:

BMWGuy
December 22nd, 2009, 14:30
2001 XJ Sport, 4.0 engine, auto., 4WD, 120k miles. 19 hwy/13-17 city. I just wish I could fill the stupid tank. During the winter I'm lucky to get 200 miles out of a tank. Have never been able to put in more than 17 gals.

winterbeater
December 22nd, 2009, 14:40
2001 XJ Sport, 4.0 engine, auto., 4WD, 120k miles. 19 hwy/13-17 city. I just wish I could fill the stupid tank. During the winter I'm lucky to get 200 miles out of a tank. Have never been able to put in more than 17 gals.

That's because you don't run it out of gas all the way. What are you afraid of, highway muggers? :roflmao:

MaxxXJ
December 22nd, 2009, 17:52
That's because you don't run it out of gas all the way. What are you afraid of, highway muggers? :roflmao:

any try filling up your tank with the nozzle on the first click in... if you squeeze the handle all the way before you lock it in place the bubbles in the fuel will trip the nozzle before its full... it takes longer but i always " bury" the needle that way.

BMWGuy
December 23rd, 2009, 14:48
That's because you don't run it out of gas all the way. What are you afraid of, highway muggers? :roflmao:

I had a '95 4.0, same problem. I bury the needle when I fill it. Usually will take 2 extra gallons after the first time the nozzle clicks off. I try to avoid running it dry so I don't damage the fuel pump. Might try it though as I'm due for a fuel filter R&R.

Davinator61
January 14th, 2011, 15:39
Sorry to necro this thread, but here goes: 1991 Laredo 4.0L, AW4, Thorley Header replacement for a cracked OE exhaust manifold in '05 (may also now have a crack, as I ran it for almost a year without a flex-tube on the front-pipe), Home-Brew Cold Air Intake w/ Amsoil EaA 6"x9" Cone Air Filter, new Aftermarket Coolant Temp Sensor, switchable OE Intake Air Temp Sensors on intake manifold & on Cold Air Intake tube (both may need replacing as both are more than 10 years old), OE Manifold Absolute Pressure Sensor (may be a little inaccurate due to age), Aftermarket O2 Sensor (may also be a little sluggish due to age & manufacturer's design flaws), OE Throttle Position Sensor (may also be problematic due to age), fuel injectors replaced recently w/4-hole reman'd Bosches, 3.73 estimated Gear Reduction in F&R Diffs (put in by previous owner?), 31X10.5R15 Mastercraft C/T tires @ 35-40 PSI for pavement driving, all lubes replaced with Amsoil Full Synthetic (Power Steering included), catalytic converter is OE (no apparent blockages when tested for back-pressure), muffler & Tail-pipe are replacements (also good), engine compression not yet tested, all oil leaks taken care of as best I can. :lecture:

Fuel economy per 15 gallon average tank-up ranges between 180-195 miles. Would prefer around 225-240 per 15 gallon tank-up. I'm kinda curious as to how much on the right track you think I'm on with all that I've listed as possible problems & fixes for my currently-poor per-tank fuel economy.:dunno:

ktwalker01
January 15th, 2011, 06:17
99 4.0L ax-15 4x4 np231 4 door 8.25 d30 3.07 stock tires 198,000.

350 ~ 17.5 city 430 ~ 22 highway

I would imagine this is what a healthy XJ should be running. I recently was having some poor mpg, but not throwing any codes and replaced my 02 about a week ago and all is back to normal again.

truck7575
January 15th, 2011, 07:27
here is food for thought, fill your tank up, then reset your trip meter, then drive it. See how many gallons it takes to fill it back up. Then you can see almost exactly how much gas you have used and use your mileage to figure your mpg, assuming your odo is accurate in the first place, I bet nobody or at least most people in this whole post has a 100% accurate odometer so at best were all approximating.

srmitchell
January 15th, 2011, 10:07
I just drove back up to Humboldt on 18 gallons, and it was 320 miles. Not bad.

winterbeater
January 15th, 2011, 10:29
My last tank of gas in my 2000 XJ lasted 6 months! Hasta