Mpg.
#17
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Location: Michigan
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Year: 1989
Model: Cherokee
Engine: 4.0 Inline Six
Mpg.
I'm with Mark on this. And Flintstone.
Do my Tips 1 through 5. Free.
Spray carb cleaner around the MAP to Throttle Body tube. Make sure intake manifold bolts aren't loose.
What's a "semi-tune-up"?
I hope in college they teach you how to approach things systematically, logically and with the correct data.
Do my Tips 1 through 5. Free.
Spray carb cleaner around the MAP to Throttle Body tube. Make sure intake manifold bolts aren't loose.
What's a "semi-tune-up"?
I hope in college they teach you how to approach things systematically, logically and with the correct data.
#18
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Year: 1987
Model: Cherokee
Engine: 4.0
The swap to 746 injectors gained some MPG for me, as well as performance.
My '87 loves 76 gas. I've ran everything from budget gas to Chevron and Shell but it gets at least 3mpg better and runs better on gas from the 76 stations.
My '87 loves 76 gas. I've ran everything from budget gas to Chevron and Shell but it gets at least 3mpg better and runs better on gas from the 76 stations.
#19
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Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
4% was just for me! You need to figure out if yours is correct or not, and if not, how far off is it.
I have 235's. If the conversion charts were correct that would mean mine came with 215's or something. I just used the mile markers to figure I'm 4% off. (so to drive 50 MPH I put the needle on 48), or if it says I went 300 miles I went 312.
Yours might be 3 times that, Idk. Besides the map tube and cruisers tips, your 02 sensor is a big player for mileage also.
I have 235's. If the conversion charts were correct that would mean mine came with 215's or something. I just used the mile markers to figure I'm 4% off. (so to drive 50 MPH I put the needle on 48), or if it says I went 300 miles I went 312.
Yours might be 3 times that, Idk. Besides the map tube and cruisers tips, your 02 sensor is a big player for mileage also.
#20
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Year: 2001
Model: Cherokee
Engine: 4.0
What you have is what you get. I get 11.5 miles to the gallon mixed town and freeway driving with the AC on according to my latest fill up. 2001 XJ, 4.5 inch lift, fresh tune up, 32s, 3.55 gears, lunch box lockers front and rear, every U joint replaced in the last 6 months.
Our XJs are driving bricks, not exactly airodynamic lol
Our XJs are driving bricks, not exactly airodynamic lol
#21
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Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
I got 19.6 on my last tank.
Box stock, of course , so I know it's not a direct comparison. I just had to rub that in.
Box stock, of course , so I know it's not a direct comparison. I just had to rub that in.
#22
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Year: 1999
Model: Cherokee
Engine: 4.0L I6
Mpg.
You lucky bastard. Bone stock and I get 17 no matter what. Towing my grandpa's boat 17. Running to work and back 17. 400 miles down the freeway 17. About the only time I don't get 17 is when I'm running in low range on the sand all day. Then it goes down to 12 or so.
#23
My son has a '99 sport with 31s and a 4.0. We took a trip to the school he will be going to in the fall. 88 mile round trip. 12 gallons of fuel!
We will be going through each of these steps and posting the results. Thanks for all of the documented knowledge!
irmachinist
Dublin Tx.
We will be going through each of these steps and posting the results. Thanks for all of the documented knowledge!
irmachinist
Dublin Tx.
#24
Beach Bum
I switched from 31" BFG AT mounted on heavy wheels, to Cooper AT3 'P' version of 31" (265-75-15) mounted on lighter ravine wheels.
Performance improved, quicker off the line, accelerates better, passing on highway is easier and MPG increased.
Stock 3.55 gears.
Performance improved, quicker off the line, accelerates better, passing on highway is easier and MPG increased.
Stock 3.55 gears.
#25
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Year: 1999
Model: Cherokee
Engine: 4.0
My son has a '99 sport with 31s and a 4.0. We took a trip to the school he will be going to in the fall. 88 mile round trip. 12 gallons of fuel!
We will be going through each of these steps and posting the results. Thanks for all of the documented knowledge!
irmachinist
Dublin Tx.
We will be going through each of these steps and posting the results. Thanks for all of the documented knowledge!
irmachinist
Dublin Tx.
Like Steve said you have a gearing problem for 31" tires it needs 4.10 gears to get the MPG where they should be, really the only.
I have a 99 with quite a few mods 4 1/2" lift, after market bumpers (Heavy), roof rack homemade, armor, with about 140-160# in cargo area all the time. I run 33x12:50x15's on heavy steel wheels with the proper gear a 4.56 and get 16-18mpg with it same 4.0/AW4/NP231.
Before the gear change I ran 31's and the 33's with the 3.55 gears and it sucked plus the trans was up/down shifting all the time along with overheating.
#27
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Year: 1989
Model: Cherokee
Engine: 4.0 Inline Six
Mpg.
Like Steve said you have a gearing problem for 31" tires it needs 4.10 gears to get the MPG where they should be, really the only.
I have a 99 with quite a few mods 4 1/2" lift, after market bumpers (Heavy), roof rack homemade, armor, with about 140-160# in cargo area all the time. I run 33x12:50x15's on heavy steel wheels with the proper gear a 4.56 and get 16-18mpg with it same 4.0/AW4/NP231.
Before the gear change I ran 31's and the 33's with the 3.55 gears and it sucked plus the trans was up/down shifting all the time along with overheating.
I have a 99 with quite a few mods 4 1/2" lift, after market bumpers (Heavy), roof rack homemade, armor, with about 140-160# in cargo area all the time. I run 33x12:50x15's on heavy steel wheels with the proper gear a 4.56 and get 16-18mpg with it same 4.0/AW4/NP231.
Before the gear change I ran 31's and the 33's with the 3.55 gears and it sucked plus the trans was up/down shifting all the time along with overheating.
#28
Like Steve said you have a gearing problem for 31" tires it needs 4.10 gears to get the MPG where they should be, really the only.
I have a 99 with quite a few mods 4 1/2" lift, after market bumpers (Heavy), roof rack homemade, armor, with about 140-160# in cargo area all the time. I run 33x12:50x15's on heavy steel wheels with the proper gear a 4.56 and get 16-18mpg with it same 4.0/AW4/NP231.
Before the gear change I ran 31's and the 33's with the 3.55 gears and it sucked plus the trans was up/down shifting all the time along with overheating.
I have a 99 with quite a few mods 4 1/2" lift, after market bumpers (Heavy), roof rack homemade, armor, with about 140-160# in cargo area all the time. I run 33x12:50x15's on heavy steel wheels with the proper gear a 4.56 and get 16-18mpg with it same 4.0/AW4/NP231.
Before the gear change I ran 31's and the 33's with the 3.55 gears and it sucked plus the trans was up/down shifting all the time along with overheating.
i_r_
#30
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