XJ gas mileage
CF Veteran
Joined: Aug 2019
Posts: 1,487
Likes: 273
From: Littleton, CO
Year: '96
Model: Cherokee (XJ)
Engine: 4.0 HO
you're taking what I said a bit to literal my guy. What if I said you can put the 258 crank in the 4.0 , we meet in the middle , lets it was designed in the 70's? It's an old *** engine and it is clearly was built around very old design principles. I never said it was a bad engine, it's an old engine. AMC was building and revising this setup for decades. start with a 232 in the 60's, stretch the block and a few bits to create the 258, then do some more edits and boom a 242 4.0. The 4.0 had similar or better economy and power numbers compared to its competitors in the 80's but dang dude they made the 4.0 til like 07. Everyone else was wayyy passed it by that time.
Bob Sheaves himself said this-
Saying it was designed in the 60's is a good one liner to say it's literally a modified 199. please correct me some more.
Bob Sheaves himself said this-
Saying it was designed in the 60's is a good one liner to say it's literally a modified 199. please correct me some more.
Seasoned Member
Joined: Feb 2021
Posts: 332
Likes: 72
From: Nashville
Year: 2001
Model: Cherokee (XJ)
Engine: 4.0
I just averaged 18.2 on a 900 mile trip. 70mph. Some TN hills, and indiana flats.
31” ko2 at 26psi, 4.5 lift. Stock other than that.
I only get about 15mpg city.
31” ko2 at 26psi, 4.5 lift. Stock other than that.
I only get about 15mpg city.
Last edited by Lynn Gräber; May 8, 2021 at 10:19 PM.
Seasoned Member
Joined: Jan 2021
Posts: 324
Likes: 27
From: North North California
Year: 1992 with 260k miles
Model: Cherokee (XJ)
Engine: 4.0 Inline 6
My gas gauge is broken, and I have only filled the tank once. So I have to use my odometer to calculate when I have to get more gas. If I drive mostly on highways where the speed limit is 55, with lots of turns and varying speeds while stopping at intersections. Then sometimes through small towns with a 30 mph speed limit, and also sometimes on dirt roads. Would this count as city, and highway driving, or just highway since there is no stop and go traffic. Also, how many miles per tank would I get?
CF Veteran
Joined: Feb 2010
Posts: 2,004
Likes: 40
From: corpus christi, texas
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0 I6
i would start by filling at 200 miles each time and get a gauge on how much fuel you are putting in, @evil_goat than you can go to 250 if you are only filling between 1/2 and 3/4.
i had a truck with the same issue. a Mazda 2500. i ended up being able to go to 300 per tank. i found out later that the low fuel light worked so it would alert me when it was time to get gas but my 300 mile ended up being good city and highway
i had a truck with the same issue. a Mazda 2500. i ended up being able to go to 300 per tank. i found out later that the low fuel light worked so it would alert me when it was time to get gas but my 300 mile ended up being good city and highway
Junior Member
Joined: Oct 2018
Posts: 98
Likes: 22
From: Pacific Northwest
Year: 1989
Model: Cherokee (XJ)
Engine: 4.0L
you're taking what I said a bit to literal my guy. What if I said you can put the 258 crank in the 4.0 , we meet in the middle , lets it was designed in the 70's? It's an old *** engine and it is clearly was built around very old design principles. I never said it was a bad engine, it's an old engine. AMC was building and revising this setup for decades. start with a 232 in the 60's, stretch the block and a few bits to create the 258, then do some more edits and boom a 242 4.0. The 4.0 had similar or better economy and power numbers compared to its competitors in the 80's but dang dude they made the 4.0 til like 07. Everyone else was wayyy passed it by that time.
Bob Sheaves himself said this-
Saying it was designed in the 60's is a good one liner to say it's literally a modified 199. please correct me some more.
Bob Sheaves himself said this-
Saying it was designed in the 60's is a good one liner to say it's literally a modified 199. please correct me some more.
At its basic core the 4.0 is an old engine, helped out some by the introduction of port fuel injection which allows for higher compression and some other pretty peripheral improvements. I got
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